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 function Search(menu) {
   this.menu = menu;
@@ -1851,7 +1851,7 @@
     display: none; 
   }
 }
-</style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intro" title="Introduction">Introduction</a></li><li><span class="item-toggle">◢</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">1</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">1.1</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-create-array-from-list-or-restricted" title="CreateArrayFromListOrRestricted ( list , restricted )"><span class="secnum">1.1.1</span> CreateArrayFromListOrRestricted ( <var>list</var> , <var>restricted</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-calendars-of-locale" title="CalendarsOfLocale ( loc )"><span class="secnum">1.1.2</span> CalendarsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collations-of-locale" title="CollationsOfLocale ( loc )"><span class="secnum">1.1.3</span> CollationsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-hour-cycles-of-locale" title="HourCyclesOfLocale ( loc )"><span class="secnum">1.1.4</span> HourCyclesOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-numbering-systems-of-locale" title="NumberingSystemsOfLocale ( loc )"><span class="secnum">1.1.5</span> NumberingSystemsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-time-zones-of-locale" title="TimeZonesOfLocale ( loc )"><span class="secnum">1.1.6</span> TimeZonesOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-character-direction-of-locale" title="CharacterDirectionOfLocale ( loc )"><span class="secnum">1.1.7</span> CharacterDirectionOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-weekday-to-string" title="WeekdayToString ( fw )"><span class="secnum">1.1.8</span> WeekdayToString ( <var>fw</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-week-info-of-locale" title="WeekInfoOfLocale ( loc )"><span class="secnum">1.1.9</span> WeekInfoOfLocale ( <var>loc</var> )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">1.2</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-apply-options-to-tag" title="ApplyOptionsToTag ( tag, options )"><span class="secnum">1.2.1</span> ApplyOptionsToTag ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-apply-unicode-extension-to-tag" title="ApplyUnicodeExtensionToTag ( tag, options, relevantExtensionKeys )"><span class="secnum">1.2.2</span> ApplyUnicodeExtensionToTag ( <var>tag</var>, <var>options</var>, <var>relevantExtensionKeys</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">1.2.3</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">1.3</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">1.3.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">1.3.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">1.4</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">1.4.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype-@@tostringtag" title="Intl.Locale.prototype[ @@toStringTag ]"><span class="secnum">1.4.2</span> Intl.Locale.prototype[ @@toStringTag ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">1.4.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">1.4.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">1.4.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">1.4.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">1.4.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">1.4.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">1.4.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.firstDayOfWeek" title="get Intl.Locale.prototype.firstDayOfWeek"><span class="secnum">1.4.10</span> get Intl.Locale.prototype.firstDayOfWeek</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">1.4.11</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">1.4.12</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">1.4.13</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">1.4.14</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">1.4.15</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">1.4.16</span> get Intl.Locale.prototype.region</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getCalendars" title="Intl.Locale.prototype.getCalendars ( )"><span class="secnum">1.4.17</span> Intl.Locale.prototype.getCalendars ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getCollations" title="Intl.Locale.prototype.getCollations ( )"><span class="secnum">1.4.18</span> Intl.Locale.prototype.getCollations ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getHourCycles" title="Intl.Locale.prototype.getHourCycles ( )"><span class="secnum">1.4.19</span> Intl.Locale.prototype.getHourCycles ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getNumberingSystems" title="Intl.Locale.prototype.getNumberingSystems ( )"><span class="secnum">1.4.20</span> Intl.Locale.prototype.getNumberingSystems ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getTimeZones" title="Intl.Locale.prototype.getTimeZones ( )"><span class="secnum">1.4.21</span> Intl.Locale.prototype.getTimeZones ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getTextInfo" title="Intl.Locale.prototype.getTextInfo ( )"><span class="secnum">1.4.22</span> Intl.Locale.prototype.getTextInfo ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getWeekInfo" title="Intl.Locale.prototype.getWeekInfo ( )"><span class="secnum">1.4.23</span> Intl.Locale.prototype.getWeekInfo ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">1.5</span> Properties of Intl.Locale Instances</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">B</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version first">Stage 3 Draft / July 19, 2024</h1><h1 class="title">Intl Locale Info Proposal</h1>
+</style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intro" title="Introduction">Introduction</a></li><li><span class="item-toggle">◢</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">1</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#sec-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">1.1</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-create-array-from-list-or-restricted" title="CreateArrayFromListOrRestricted ( list , restricted )"><span class="secnum">1.1.1</span> CreateArrayFromListOrRestricted ( <var>list</var> , <var>restricted</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-calendars-of-locale" title="CalendarsOfLocale ( loc )"><span class="secnum">1.1.2</span> CalendarsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collations-of-locale" title="CollationsOfLocale ( loc )"><span class="secnum">1.1.3</span> CollationsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-hour-cycles-of-locale" title="HourCyclesOfLocale ( loc )"><span class="secnum">1.1.4</span> HourCyclesOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-numbering-systems-of-locale" title="NumberingSystemsOfLocale ( loc )"><span class="secnum">1.1.5</span> NumberingSystemsOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-time-zones-of-locale" title="TimeZonesOfLocale ( loc )"><span class="secnum">1.1.6</span> TimeZonesOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-character-direction-of-locale" title="CharacterDirectionOfLocale ( loc )"><span class="secnum">1.1.7</span> CharacterDirectionOfLocale ( <var>loc</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-weekday-to-string" title="WeekdayToString ( fw )"><span class="secnum">1.1.8</span> WeekdayToString ( <var>fw</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-string-to-weekday-value" title="StringToWeekdayValue ( fw )"><span class="secnum">1.1.9</span> StringToWeekdayValue ( <var>fw</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-week-info-of-locale" title="WeekInfoOfLocale ( loc )"><span class="secnum">1.1.10</span> WeekInfoOfLocale ( <var>loc</var> )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">1.2</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-apply-options-to-tag" title="ApplyOptionsToTag ( tag, options )"><span class="secnum">1.2.1</span> ApplyOptionsToTag ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-apply-unicode-extension-to-tag" title="ApplyUnicodeExtensionToTag ( tag, options, relevantExtensionKeys )"><span class="secnum">1.2.2</span> ApplyUnicodeExtensionToTag ( <var>tag</var>, <var>options</var>, <var>relevantExtensionKeys</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">1.2.3</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">1.3</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">1.3.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">1.3.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">1.4</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">1.4.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype-@@tostringtag" title="Intl.Locale.prototype[ @@toStringTag ]"><span class="secnum">1.4.2</span> Intl.Locale.prototype[ @@toStringTag ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">1.4.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">1.4.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">1.4.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">1.4.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">1.4.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">1.4.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">1.4.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.firstDayOfWeek" title="get Intl.Locale.prototype.firstDayOfWeek"><span class="secnum">1.4.10</span> get Intl.Locale.prototype.firstDayOfWeek</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">1.4.11</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">1.4.12</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">1.4.13</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">1.4.14</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">1.4.15</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">1.4.16</span> get Intl.Locale.prototype.region</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getCalendars" title="Intl.Locale.prototype.getCalendars ( )"><span class="secnum">1.4.17</span> Intl.Locale.prototype.getCalendars ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getCollations" title="Intl.Locale.prototype.getCollations ( )"><span class="secnum">1.4.18</span> Intl.Locale.prototype.getCollations ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getHourCycles" title="Intl.Locale.prototype.getHourCycles ( )"><span class="secnum">1.4.19</span> Intl.Locale.prototype.getHourCycles ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getNumberingSystems" title="Intl.Locale.prototype.getNumberingSystems ( )"><span class="secnum">1.4.20</span> Intl.Locale.prototype.getNumberingSystems ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getTimeZones" title="Intl.Locale.prototype.getTimeZones ( )"><span class="secnum">1.4.21</span> Intl.Locale.prototype.getTimeZones ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getTextInfo" title="Intl.Locale.prototype.getTextInfo ( )"><span class="secnum">1.4.22</span> Intl.Locale.prototype.getTextInfo ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.getWeekInfo" title="Intl.Locale.prototype.getWeekInfo ( )"><span class="secnum">1.4.23</span> Intl.Locale.prototype.getWeekInfo ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">1.5</span> Properties of Intl.Locale Instances</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">B</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version first">Stage 3 Draft / July 30, 2024</h1><h1 class="title">Intl Locale Info Proposal</h1>
 
 <emu-intro id="sec-intro">
   <h1>Introduction</h1>
@@ -1873,7 +1873,7 @@ <h1><span class="secnum">1.1.1</span> CreateArrayFromListOrRestricted ( <var>lis
       <p>
         The abstract operation CreateArrayFromListOrRestricted accepts the arguments <var>list</var> and <var>restricted</var> , and performs the following steps:
       </p>
-      <emu-alg><ol><li>If <var>restricted</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>list</var> to « <var>restricted</var> ».</li></ol></li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_10"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>list</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>If <var>restricted</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>list</var> to « <var>restricted</var> ».</li></ol></li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_11"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>list</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-calendars-of-locale" aoid="CalendarsOfLocale">
@@ -1882,7 +1882,7 @@ <h1><span class="secnum">1.1.2</span> CalendarsOfLocale ( <var>loc</var> )</h1>
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[Calendar]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical calendar identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, sorted in descending preference of those in common use for date and time formatting in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_11"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[Calendar]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical calendar identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, sorted in descending preference of those in common use for date and time formatting in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_12"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-collations-of-locale" aoid="CollationsOfLocale">
@@ -1891,7 +1891,7 @@ <h1><span class="secnum">1.1.3</span> CollationsOfLocale ( <var>loc</var> )</h1>
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[Collation]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical collation identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, ordered as if an Array of the same values had been sorted, using %Array.prototype.sort% using <emu-val>undefined</emu-val> as <var>comparefn</var>, of those in common use for string comparison in <var>locale</var>. The values <emu-val>"standard"</emu-val> and <emu-val>"search"</emu-val> must be excluded from <var>list</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_12"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[Collation]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical collation identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, ordered as if an Array of the same values had been sorted, using %Array.prototype.sort% using <emu-val>undefined</emu-val> as <var>comparefn</var>, of those in common use for string comparison in <var>locale</var>. The values <emu-val>"standard"</emu-val> and <emu-val>"search"</emu-val> must be excluded from <var>list</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_13"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-hour-cycles-of-locale" aoid="HourCyclesOfLocale">
@@ -1900,7 +1900,7 @@ <h1><span class="secnum">1.1.4</span> HourCyclesOfLocale ( <var>loc</var> )</h1>
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[HourCycle]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique hour cycle identifiers, which must be lower case String values indicating either the 12-hour format (<emu-val>"h11"</emu-val>, <emu-val>"h12"</emu-val>) or the 24-hour format (<emu-val>"h23"</emu-val>, <emu-val>"h24"</emu-val>), sorted in descending preference of those in common use for date and time formatting in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_13"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[HourCycle]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique hour cycle identifiers, which must be lower case String values indicating either the 12-hour format (<emu-val>"h11"</emu-val>, <emu-val>"h12"</emu-val>) or the 24-hour format (<emu-val>"h23"</emu-val>, <emu-val>"h24"</emu-val>), sorted in descending preference of those in common use for date and time formatting in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_14"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-numbering-systems-of-locale" aoid="NumberingSystemsOfLocale">
@@ -1909,7 +1909,7 @@ <h1><span class="secnum">1.1.5</span> NumberingSystemsOfLocale ( <var>loc</var>
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[NumberingSystem]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical numbering system identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, sorted in descending preference of those in common use for formatting numeric values in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_14"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>restricted</var> be <var>loc</var>.[[NumberingSystem]].</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of 1 or more unique canonical numbering system identifiers, which must be lower case String values conforming to the type sequence from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>, sorted in descending preference of those in common use for formatting numeric values in <var>locale</var>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromListOrRestricted" id="_ref_15"><a href="#sec-create-array-from-list-or-restricted">CreateArrayFromListOrRestricted</a></emu-xref>( <var>list</var>, <var>restricted</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-time-zones-of-locale" aoid="TimeZonesOfLocale">
@@ -1918,7 +1918,7 @@ <h1><span class="secnum">1.1.6</span> TimeZonesOfLocale ( <var>loc</var> )</h1>
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>region</var> be the substring of <var>locale</var> corresponding to the <code>unicode_region_subtag</code> production of the <code>unicode_language_id</code>.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of unique canonical time zone identifiers, which must be String values indicating a canonical Zone name of the IANA Time Zone Database, ordered as if an Array of the same values had been sorted using %Array.prototype.sort% using <emu-val>undefined</emu-val> as <var>comparefn</var>, of those in common use in <var>region</var>. If no time zones are commonly used in <var>region</var>, let list be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_15"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>list</var> ).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>region</var> be the substring of <var>locale</var> corresponding to the <code>unicode_region_subtag</code> production of the <code>unicode_language_id</code>.</li><li>Let <var>list</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of unique canonical time zone identifiers, which must be String values indicating a canonical Zone name of the IANA Time Zone Database, ordered as if an Array of the same values had been sorted using %Array.prototype.sort% using <emu-val>undefined</emu-val> as <var>comparefn</var>, of those in common use in <var>region</var>. If no time zones are commonly used in <var>region</var>, let list be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Return !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_16"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>list</var> ).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-character-direction-of-locale" aoid="CharacterDirectionOfLocale">
@@ -1935,59 +1935,76 @@ <h1><span class="secnum">1.1.8</span> WeekdayToString ( <var>fw</var> )</h1>
       <p>
         The abstract operation WeekdayToString accepts the argument <var>fw</var> , and performs the following steps:
       </p>
-      <emu-alg><ol><li>For each row of <emu-xref href="#table-locale-first-day-option-type" id="_ref_0"><a href="#table-locale-first-day-option-type">Table 1</a></emu-xref>, except the header row, in table order, do<ol><li>Let <var>v</var> be the name given in the Value column of the row.</li><li>Let <var>t</var> be the name given in the Type column of the row.</li><li>If <var>fw</var> is equal to <var>v</var>, return <var>t</var>.</li></ol></li><li>Return <var>fw</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>For each row of <emu-xref href="#table-locale-first-day-option-value" id="_ref_0"><a href="#table-locale-first-day-option-value">Table 1</a></emu-xref>, except the header row, in table order, do<ol><li>Let <var>w</var> be the name given in the Weekday column of the row.</li><li>Let <var>s</var> be the name given in the String column of the row.</li><li>If <var>fw</var> is equal to <var>w</var>, return <var>s</var>.</li></ol></li><li>Return <var>fw</var>.</li></ol></emu-alg>
 
-      <emu-table id="table-locale-first-day-option-type"><figure><figcaption>Table 1: First <emu-xref aoid="Day"><a href="https://tc39.es/ecma262/#eqn-Day">Day</a></emu-xref> Value and Type</figcaption>
+      <emu-table id="table-locale-first-day-option-value"><figure><figcaption>Table 1: First <emu-xref aoid="Day"><a href="https://tc39.es/ecma262/#eqn-Day">Day</a></emu-xref> String and Value</figcaption>
         
         <table class="real-table">
           <thead>
             <tr>
+              <th>Weekday</th>
+              <th>String</th>
               <th>Value</th>
-              <th>Type</th>
             </tr>
           </thead>
           <tbody><tr>
             <td><emu-val>"0"</emu-val></td>
             <td><emu-val>"sun"</emu-val></td>
+            <td><emu-val>7</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"1"</emu-val></td>
             <td><emu-val>"mon"</emu-val></td>
+            <td><emu-val>1</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"2"</emu-val></td>
             <td><emu-val>"tue"</emu-val></td>
+            <td><emu-val>2</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"3"</emu-val></td>
             <td><emu-val>"wed"</emu-val></td>
+            <td><emu-val>3</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"4"</emu-val></td>
             <td><emu-val>"thu"</emu-val></td>
+            <td><emu-val>4</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"5"</emu-val></td>
             <td><emu-val>"fri"</emu-val></td>
+            <td><emu-val>5</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"6"</emu-val></td>
             <td><emu-val>"sat"</emu-val></td>
+            <td><emu-val>6</emu-val></td>
           </tr>
           <tr>
             <td><emu-val>"7"</emu-val></td>
             <td><emu-val>"sun"</emu-val></td>
+            <td><emu-val>7</emu-val></td>
           </tr>
         </tbody></table>
       </figure></emu-table>
     </emu-clause>
 
+    <emu-clause id="sec-string-to-weekday-value" aoid="StringToWeekdayValue">
+      <h1><span class="secnum">1.1.9</span> StringToWeekdayValue ( <var>fw</var> )</h1>
+      <p>
+        The abstract operation StringToWeekdayValue accepts the argument <var>fw</var> , and performs the following steps:
+      </p>
+      <emu-alg><ol><li>For each row of <emu-xref href="#table-locale-first-day-option-value" id="_ref_1"><a href="#table-locale-first-day-option-value">Table 1</a></emu-xref>, except the header row, in table order, do<ol><li>Let <var>s</var> be the name given in the String column of the row.</li><li>Let <var>v</var> be the name given in the Value column of the row.</li><li>If <var>fw</var> is equal to <var>s</var>, return <var>v</var>.</li></ol></li><li>Return <emu-val>undefined</emu-val>.</li></ol></emu-alg>
+    </emu-clause>
+
     <emu-clause id="sec-week-info-of-locale" aoid="WeekInfoOfLocale">
-      <h1><span class="secnum">1.1.9</span> WeekInfoOfLocale ( <var>loc</var> )</h1>
+      <h1><span class="secnum">1.1.10</span> WeekInfoOfLocale ( <var>loc</var> )</h1>
       <p>
         The abstract operation WeekInfoOfLocale accepts the argument <var>loc</var> , and performs the following steps:
       </p>
-      <emu-alg><ol><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>r</var> be a record whose fields are defined by <emu-xref href="#table-locale-weekinfo-record" id="_ref_1"><a href="#table-locale-weekinfo-record">Table 2</a></emu-xref>, with values based on <var>locale</var>.</li><li>Let <var>fw</var> be <var>loc</var>.[[FirstDayOfWeek]].</li><li>If <var>fw</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>r</var>.[[FirstDay]] to <var>fw</var>.</li></ol></li><li>Return <var>r</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>locale</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>r</var> be a record whose fields are defined by <emu-xref href="#table-locale-weekinfo-record" id="_ref_2"><a href="#table-locale-weekinfo-record">Table 2</a></emu-xref>, with values based on <var>locale</var>.</li><li>Let <var>fws</var> be <var>loc</var>.[[FirstDayOfWeek]].</li><li>Let <var>fw</var> be !<emu-xref aoid="StringToWeekdayValue" id="_ref_17"><a href="#sec-string-to-weekday-value">StringToWeekdayValue</a></emu-xref>(<var>fws</var>).</li><li>If <var>fw</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>r</var>.[[FirstDay]] to <var>fw</var>.</li></ol></li><li>Return <var>r</var>.</li></ol></emu-alg>
 
       <emu-table id="table-locale-weekinfo-record"><figure><figcaption>Table 2: WeekInfo <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> Fields</figcaption>
         
@@ -2035,7 +2052,7 @@ <h1><span class="secnum">1.2.1</span> ApplyOptionsToTag ( <var>tag</var>, <var>o
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_16"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is String.</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_17"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>options</var>) is Object.</li><li>If IsStructurallyValidLanguageTag(<var>tag</var>) is <emu-val>false</emu-val>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>language</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"language"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>language</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>language</var> does not match the <code>unicode_language_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Let <var>script</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"script"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>script</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>script</var> does not match the <code>unicode_script_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Let <var>region</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"region"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>region</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>region</var> does not match the <code>unicode_region_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>tag</var> to CanonicalizeUnicodeLocaleId(<var>tag</var>).</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>tag</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>languageId</var> be the substring of <var>tag</var> corresponding to the <code>unicode_language_id</code> production.</li><li>If <var>language</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_language_subtag</code> production replaced by the string <var>language</var>.</li></ol></li><li>If <var>script</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>languageId</var> does not contain a <code>unicode_script_subtag</code> production, then<ol><li>Set <var>languageId</var> to the <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">string-concatenation</a></emu-xref> of the <code>unicode_language_subtag</code> production of <var>languageId</var>, <emu-val>"-"</emu-val>, <var>script</var>, and the rest of <var>languageId</var>.</li></ol></li><li>Else,<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_script_subtag</code> production replaced by the string <var>script</var>.</li></ol></li></ol></li><li>If <var>region</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>languageId</var> does not contain a <code>unicode_region_subtag</code> production, then<ol><li>Set <var>languageId</var> to the <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">string-concatenation</a></emu-xref> of the <code>unicode_language_subtag</code> production of <var>languageId</var>, the substring corresponding to <code>"-"</code> and the <code>unicode_script_subtag</code> production if present, <code>"-"</code>, <var>region</var>, and the rest of <var>languageId</var>.</li></ol></li><li>Else,<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_region_subtag</code> production replaced by the string <var>region</var>.</li></ol></li></ol></li><li>Set <var>tag</var> to <var>tag</var> with the substring corresponding to the <code>unicode_language_id</code> production replaced by the string <var>languageId</var>.</li><li>Return CanonicalizeUnicodeLocaleId(<var>tag</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_18"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is String.</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_19"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>options</var>) is Object.</li><li>If IsStructurallyValidLanguageTag(<var>tag</var>) is <emu-val>false</emu-val>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>language</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"language"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>language</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>language</var> does not match the <code>unicode_language_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Let <var>script</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"script"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>script</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>script</var> does not match the <code>unicode_script_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Let <var>region</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"region"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>region</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>region</var> does not match the <code>unicode_region_subtag</code> production, throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>tag</var> to CanonicalizeUnicodeLocaleId(<var>tag</var>).</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>tag</var> matches the <code>unicode_locale_id</code> production.</li><li>Let <var>languageId</var> be the substring of <var>tag</var> corresponding to the <code>unicode_language_id</code> production.</li><li>If <var>language</var> is not <emu-val>undefined</emu-val>, then<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_language_subtag</code> production replaced by the string <var>language</var>.</li></ol></li><li>If <var>script</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>languageId</var> does not contain a <code>unicode_script_subtag</code> production, then<ol><li>Set <var>languageId</var> to the <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">string-concatenation</a></emu-xref> of the <code>unicode_language_subtag</code> production of <var>languageId</var>, <emu-val>"-"</emu-val>, <var>script</var>, and the rest of <var>languageId</var>.</li></ol></li><li>Else,<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_script_subtag</code> production replaced by the string <var>script</var>.</li></ol></li></ol></li><li>If <var>region</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>languageId</var> does not contain a <code>unicode_region_subtag</code> production, then<ol><li>Set <var>languageId</var> to the <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">string-concatenation</a></emu-xref> of the <code>unicode_language_subtag</code> production of <var>languageId</var>, the substring corresponding to <code>"-"</code> and the <code>unicode_script_subtag</code> production if present, <code>"-"</code>, <var>region</var>, and the rest of <var>languageId</var>.</li></ol></li><li>Else,<ol><li>Set <var>languageId</var> to <var>languageId</var> with the substring corresponding to the <code>unicode_region_subtag</code> production replaced by the string <var>region</var>.</li></ol></li></ol></li><li>Set <var>tag</var> to <var>tag</var> with the substring corresponding to the <code>unicode_language_id</code> production replaced by the string <var>languageId</var>.</li><li>Return CanonicalizeUnicodeLocaleId(<var>tag</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-apply-unicode-extension-to-tag" aoid="ApplyUnicodeExtensionToTag">
@@ -2044,7 +2061,7 @@ <h1><span class="secnum">1.2.2</span> ApplyUnicodeExtensionToTag ( <var>tag</var
         The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.
       </p>
 
-      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_18"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is String.</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>tag</var> matches the <code>unicode_locale_id</code> production.</li><li>If <var>tag</var> contains a substring that is a Unicode locale extension sequence, then<ol><li>Let <var>extension</var> be the String value consisting of the first substring of <var>tag</var> that is a Unicode locale extension sequence.</li><li>Let <var>components</var> be !&nbsp;UnicodeExtensionComponents(<var>extension</var>).</li><li>Let <var>attributes</var> be <var>components</var>.[[Attributes]].</li><li>Let <var>keywords</var> be <var>components</var>.[[Keywords]].</li></ol></li><li>Else,<ol><li>Let <var>attributes</var> be the empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>keywords</var> be the empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li></ol></li><li>Let <var>result</var> be a new <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>.</li><li>For each element <var>key</var> of <var>relevantExtensionKeys</var> in <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> order, do<ol><li>Let <var>value</var> be <emu-val>undefined</emu-val>.</li><li>If <var>keywords</var> contains an element whose [[Key]] is the same as <var>key</var>, then<ol><li>Let <var>entry</var> be the element of <var>keywords</var> whose [[Key]] is the same as <var>key</var>.</li><li>Let <var>value</var> be <var>entry</var>.[[Value]].</li></ol></li><li>Else,<ol><li>Let <var>entry</var> be <emu-const>empty</emu-const>.</li></ol></li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>options</var> has a field [[&lt;<var>key</var>&gt;]].</li><li>Let <var>optionsValue</var> be <var>options</var>.[[&lt;<var>key</var>&gt;]].</li><li>If <var>optionsValue</var> is not <emu-val>undefined</emu-val>, then<ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_19"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>optionsValue</var>) is String.</li><li>Let <var>value</var> be <var>optionsValue</var>.</li><li>If <var>entry</var> is not <emu-const>empty</emu-const>, then<ol><li>Set <var>entry</var>.[[Value]] to <var>value</var>.</li></ol></li><li>Else,<ol><li>Append the <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>{[[Key]]: <var>key</var>, [[Value]]: <var>value</var>} to <var>keywords</var>.</li></ol></li></ol></li><li>Set <var>result</var>.[[&lt;<var>key</var>&gt;]] to <var>value</var>.</li></ol></li><li>Let <var>locale</var> be the String value that is <var>tag</var> with all Unicode locale extension sequences removed.</li><li>Let <var>newExtension</var> be a Unicode BCP 47 U Extension based on <var>attributes</var> and <var>keywords</var>.</li><li>If <var>newExtension</var> is not the empty String, then<ol><li>Let <var>locale</var> be !&nbsp;InsertUnicodeExtensionAndCanonicalize(<var>locale</var>, <var>newExtension</var>).</li></ol></li><li>Set <var>result</var>.[[locale]] to <var>locale</var>.</li><li>Return <var>result</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_20"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is String.</li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>tag</var> matches the <code>unicode_locale_id</code> production.</li><li>If <var>tag</var> contains a substring that is a Unicode locale extension sequence, then<ol><li>Let <var>extension</var> be the String value consisting of the first substring of <var>tag</var> that is a Unicode locale extension sequence.</li><li>Let <var>components</var> be !&nbsp;UnicodeExtensionComponents(<var>extension</var>).</li><li>Let <var>attributes</var> be <var>components</var>.[[Attributes]].</li><li>Let <var>keywords</var> be <var>components</var>.[[Keywords]].</li></ol></li><li>Else,<ol><li>Let <var>attributes</var> be the empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>keywords</var> be the empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li></ol></li><li>Let <var>result</var> be a new <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>.</li><li>For each element <var>key</var> of <var>relevantExtensionKeys</var> in <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> order, do<ol><li>Let <var>value</var> be <emu-val>undefined</emu-val>.</li><li>If <var>keywords</var> contains an element whose [[Key]] is the same as <var>key</var>, then<ol><li>Let <var>entry</var> be the element of <var>keywords</var> whose [[Key]] is the same as <var>key</var>.</li><li>Let <var>value</var> be <var>entry</var>.[[Value]].</li></ol></li><li>Else,<ol><li>Let <var>entry</var> be <emu-const>empty</emu-const>.</li></ol></li><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>options</var> has a field [[&lt;<var>key</var>&gt;]].</li><li>Let <var>optionsValue</var> be <var>options</var>.[[&lt;<var>key</var>&gt;]].</li><li>If <var>optionsValue</var> is not <emu-val>undefined</emu-val>, then<ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <emu-xref aoid="Type" id="_ref_21"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>optionsValue</var>) is String.</li><li>Let <var>value</var> be <var>optionsValue</var>.</li><li>If <var>entry</var> is not <emu-const>empty</emu-const>, then<ol><li>Set <var>entry</var>.[[Value]] to <var>value</var>.</li></ol></li><li>Else,<ol><li>Append the <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>{[[Key]]: <var>key</var>, [[Value]]: <var>value</var>} to <var>keywords</var>.</li></ol></li></ol></li><li>Set <var>result</var>.[[&lt;<var>key</var>&gt;]] to <var>value</var>.</li></ol></li><li>Let <var>locale</var> be the String value that is <var>tag</var> with all Unicode locale extension sequences removed.</li><li>Let <var>newExtension</var> be a Unicode BCP 47 U Extension based on <var>attributes</var> and <var>keywords</var>.</li><li>If <var>newExtension</var> is not the empty String, then<ol><li>Let <var>locale</var> be !&nbsp;InsertUnicodeExtensionAndCanonicalize(<var>locale</var>, <var>newExtension</var>).</li></ol></li><li>Set <var>result</var>.[[locale]] to <var>locale</var>.</li><li>Return <var>result</var>.</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale">
@@ -2055,7 +2072,7 @@ <h1><span class="secnum">1.2.3</span> Intl.Locale ( <var>tag</var> [ , <var>opti
         When the <emu-val>Intl.Locale</emu-val> function is called with an argument <var>tag</var> and an optional argument <var>options</var>, the following steps are taken:
       </p>
 
-      <emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>relevantExtensionKeys</var> be <emu-xref href="#sec-intl-locale-constructor" id="_ref_20"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]].</li><li>Let <var>internalSlotsList</var> be « [[InitializedLocale]], [[Locale]], [[Calendar]], [[Collation]], <ins>[[FirstDayOfWeek]], </ins>[[HourCycle]], [[NumberingSystem]] ».</li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kf"</emu-val>, then<ol><li>Append [[CaseFirst]] as the last element of <var>internalSlotsList</var>.</li></ol></li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kn"</emu-val>, then<ol><li>Append [[Numeric]] as the last element of <var>internalSlotsList</var>.</li></ol></li><li>Let <var>locale</var> be ?&nbsp;<emu-xref aoid="OrdinaryCreateFromConstructor" id="_ref_21"><a href="https://tc39.es/ecma262/#sec-ordinarycreatefromconstructor">OrdinaryCreateFromConstructor</a></emu-xref>(NewTarget, <emu-val>%Locale.prototype%</emu-val>, <var>internalSlotsList</var>).</li><li>If <emu-xref aoid="Type" id="_ref_22"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is not String or Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="Type" id="_ref_23"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is Object and <var>tag</var> has an [[InitializedLocale]] internal slot, then<ol><li>Let <var>tag</var> be <var>tag</var>.[[Locale]].</li></ol></li><li>Else,<ol><li>Let <var>tag</var> be ?&nbsp;<emu-xref aoid="ToString" id="_ref_24"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>tag</var>).</li></ol></li><li>If <var>options</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>options</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_25"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(<emu-val>null</emu-val>).</li></ol></li><li>Else,<ol><li>Let <var>options</var> be ?&nbsp;<emu-xref aoid="ToObject" id="_ref_26"><a href="https://tc39.es/ecma262/#sec-toobject">ToObject</a></emu-xref>(<var>options</var>).</li></ol></li><li>Set <var>tag</var> to ?&nbsp;<emu-xref aoid="ApplyOptionsToTag" id="_ref_27"><a href="#sec-apply-options-to-tag">ApplyOptionsToTag</a></emu-xref>(<var>tag</var>, <var>options</var>).</li><li>Let <var>opt</var> be a new <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>.</li><li>Let <var>calendar</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"calendar"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>calendar</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>calendar</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[ca]] to <var>calendar</var>.</li><li>Let <var>collation</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"collation"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>collation</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>collation</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[co]] to <var>collation</var>.</li><li><ins>Let <var>fw</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"firstDayOfWeek"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</ins></li><li><ins>If <var>fw</var> is not <emu-val>undefined</emu-val>, then</ins><ol><li><ins>Set <var>fw</var> to !<emu-xref aoid="WeekdayToString" id="_ref_28"><a href="#sec-weekday-to-string">WeekdayToString</a></emu-xref>(<var>fw</var>).</ins></li><li><ins>If <var>fw</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</ins></li></ol></li><li><ins>Set <var>opt</var>.[[fw]] to <var>fw</var>.</ins></li><li>Let <var>hc</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"hourCycle"</emu-val>, <emu-val>"string"</emu-val>, « <emu-val>"h11"</emu-val>, <emu-val>"h12"</emu-val>, <emu-val>"h23"</emu-val>, <emu-val>"h24"</emu-val> », <emu-val>undefined</emu-val>).</li><li>Set <var>opt</var>.[[hc]] to <var>hc</var>.</li><li>Let <var>kf</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"caseFirst"</emu-val>, <emu-val>"string"</emu-val>, « <emu-val>"upper"</emu-val>, <emu-val>"lower"</emu-val>, <emu-val>"false"</emu-val> », <emu-val>undefined</emu-val>).</li><li>Set <var>opt</var>.[[kf]] to <var>kf</var>.</li><li>Let <var>kn</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"numeric"</emu-val>, <emu-val>"boolean"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>kn</var> is not <emu-val>undefined</emu-val>, set <var>kn</var> to !&nbsp;<emu-xref aoid="ToString" id="_ref_29"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>kn</var>).</li><li>Set <var>opt</var>.[[kn]] to <var>kn</var>.</li><li>Let <var>numberingSystem</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"numberingSystem"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>numberingSystem</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>numberingSystem</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[nu]] to <var>numberingSystem</var>.</li><li>Let <var>r</var> be !&nbsp;<emu-xref aoid="ApplyUnicodeExtensionToTag" id="_ref_30"><a href="#sec-apply-unicode-extension-to-tag">ApplyUnicodeExtensionToTag</a></emu-xref>(<var>tag</var>, <var>opt</var>, <var>relevantExtensionKeys</var>).</li><li>Set <var>locale</var>.[[Locale]] to <var>r</var>.[[locale]].</li><li>Set <var>locale</var>.[[Calendar]] to <var>r</var>.[[ca]].</li><li>Set <var>locale</var>.[[Collation]] to <var>r</var>.[[co]].</li><li><ins>Set <var>locale</var>.[[FirstDayOfWeek]] to <var>r</var>.[[fw]].</ins></li><li>Set <var>locale</var>.[[HourCycle]] to <var>r</var>.[[hc]].</li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kf"</emu-val>, then<ol><li>Set <var>locale</var>.[[CaseFirst]] to <var>r</var>.[[kf]].</li></ol></li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kn"</emu-val>, then<ol><li>If !&nbsp;<emu-xref aoid="SameValue" id="_ref_31"><a href="https://tc39.es/ecma262/#sec-samevalue">SameValue</a></emu-xref>(<var>r</var>.[[kn]], <emu-val>"true"</emu-val>) is <emu-val>true</emu-val> or <var>r</var>.[[kn]] is the empty String, then<ol><li>Set <var>locale</var>.[[Numeric]] to <emu-val>true</emu-val>.</li></ol></li><li>Else,<ol><li>Set <var>locale</var>.[[Numeric]] to <emu-val>false</emu-val>.</li></ol></li></ol></li><li>Set <var>locale</var>.[[NumberingSystem]] to <var>r</var>.[[nu]].</li><li>Return <var>locale</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>If NewTarget is <emu-val>undefined</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>relevantExtensionKeys</var> be <emu-xref href="#sec-intl-locale-constructor" id="_ref_22"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]].</li><li>Let <var>internalSlotsList</var> be « [[InitializedLocale]], [[Locale]], [[Calendar]], [[Collation]], <ins>[[FirstDayOfWeek]], </ins>[[HourCycle]], [[NumberingSystem]] ».</li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kf"</emu-val>, then<ol><li>Append [[CaseFirst]] as the last element of <var>internalSlotsList</var>.</li></ol></li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kn"</emu-val>, then<ol><li>Append [[Numeric]] as the last element of <var>internalSlotsList</var>.</li></ol></li><li>Let <var>locale</var> be ?&nbsp;<emu-xref aoid="OrdinaryCreateFromConstructor" id="_ref_23"><a href="https://tc39.es/ecma262/#sec-ordinarycreatefromconstructor">OrdinaryCreateFromConstructor</a></emu-xref>(NewTarget, <emu-val>%Locale.prototype%</emu-val>, <var>internalSlotsList</var>).</li><li>If <emu-xref aoid="Type" id="_ref_24"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is not String or Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <emu-xref aoid="Type" id="_ref_25"><a href="https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>tag</var>) is Object and <var>tag</var> has an [[InitializedLocale]] internal slot, then<ol><li>Let <var>tag</var> be <var>tag</var>.[[Locale]].</li></ol></li><li>Else,<ol><li>Let <var>tag</var> be ?&nbsp;<emu-xref aoid="ToString" id="_ref_26"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>tag</var>).</li></ol></li><li>If <var>options</var> is <emu-val>undefined</emu-val>, then<ol><li>Let <var>options</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_27"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(<emu-val>null</emu-val>).</li></ol></li><li>Else,<ol><li>Let <var>options</var> be ?&nbsp;<emu-xref aoid="ToObject" id="_ref_28"><a href="https://tc39.es/ecma262/#sec-toobject">ToObject</a></emu-xref>(<var>options</var>).</li></ol></li><li>Set <var>tag</var> to ?&nbsp;<emu-xref aoid="ApplyOptionsToTag" id="_ref_29"><a href="#sec-apply-options-to-tag">ApplyOptionsToTag</a></emu-xref>(<var>tag</var>, <var>options</var>).</li><li>Let <var>opt</var> be a new <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>.</li><li>Let <var>calendar</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"calendar"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>calendar</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>calendar</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[ca]] to <var>calendar</var>.</li><li>Let <var>collation</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"collation"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>collation</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>collation</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[co]] to <var>collation</var>.</li><li><ins>Let <var>fw</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"firstDayOfWeek"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</ins></li><li><ins>If <var>fw</var> is not <emu-val>undefined</emu-val>, then</ins><ol><li><ins>Set <var>fw</var> to !<emu-xref aoid="WeekdayToString" id="_ref_30"><a href="#sec-weekday-to-string">WeekdayToString</a></emu-xref>(<var>fw</var>).</ins></li><li><ins>If <var>fw</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</ins></li></ol></li><li><ins>Set <var>opt</var>.[[fw]] to <var>fw</var>.</ins></li><li>Let <var>hc</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"hourCycle"</emu-val>, <emu-val>"string"</emu-val>, « <emu-val>"h11"</emu-val>, <emu-val>"h12"</emu-val>, <emu-val>"h23"</emu-val>, <emu-val>"h24"</emu-val> », <emu-val>undefined</emu-val>).</li><li>Set <var>opt</var>.[[hc]] to <var>hc</var>.</li><li>Let <var>kf</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"caseFirst"</emu-val>, <emu-val>"string"</emu-val>, « <emu-val>"upper"</emu-val>, <emu-val>"lower"</emu-val>, <emu-val>"false"</emu-val> », <emu-val>undefined</emu-val>).</li><li>Set <var>opt</var>.[[kf]] to <var>kf</var>.</li><li>Let <var>kn</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"numeric"</emu-val>, <emu-val>"boolean"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>kn</var> is not <emu-val>undefined</emu-val>, set <var>kn</var> to !&nbsp;<emu-xref aoid="ToString" id="_ref_31"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>kn</var>).</li><li>Set <var>opt</var>.[[kn]] to <var>kn</var>.</li><li>Let <var>numberingSystem</var> be ?&nbsp;GetOption(<var>options</var>, <emu-val>"numberingSystem"</emu-val>, <emu-val>"string"</emu-val>, <emu-val>undefined</emu-val>, <emu-val>undefined</emu-val>).</li><li>If <var>numberingSystem</var> is not <emu-val>undefined</emu-val>, then<ol><li>If <var>numberingSystem</var> does not match the <code>type</code> sequence (from <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">UTS 35 Unicode Locale Identifier, section 3.2</a>), throw a <emu-val>RangeError</emu-val> exception.</li></ol></li><li>Set <var>opt</var>.[[nu]] to <var>numberingSystem</var>.</li><li>Let <var>r</var> be !&nbsp;<emu-xref aoid="ApplyUnicodeExtensionToTag" id="_ref_32"><a href="#sec-apply-unicode-extension-to-tag">ApplyUnicodeExtensionToTag</a></emu-xref>(<var>tag</var>, <var>opt</var>, <var>relevantExtensionKeys</var>).</li><li>Set <var>locale</var>.[[Locale]] to <var>r</var>.[[locale]].</li><li>Set <var>locale</var>.[[Calendar]] to <var>r</var>.[[ca]].</li><li>Set <var>locale</var>.[[Collation]] to <var>r</var>.[[co]].</li><li><ins>Set <var>locale</var>.[[FirstDayOfWeek]] to <var>r</var>.[[fw]].</ins></li><li>Set <var>locale</var>.[[HourCycle]] to <var>r</var>.[[hc]].</li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kf"</emu-val>, then<ol><li>Set <var>locale</var>.[[CaseFirst]] to <var>r</var>.[[kf]].</li></ol></li><li>If <var>relevantExtensionKeys</var> contains <emu-val>"kn"</emu-val>, then<ol><li>If !&nbsp;<emu-xref aoid="SameValue" id="_ref_33"><a href="https://tc39.es/ecma262/#sec-samevalue">SameValue</a></emu-xref>(<var>r</var>.[[kn]], <emu-val>"true"</emu-val>) is <emu-val>true</emu-val> or <var>r</var>.[[kn]] is the empty String, then<ol><li>Set <var>locale</var>.[[Numeric]] to <emu-val>true</emu-val>.</li></ol></li><li>Else,<ol><li>Set <var>locale</var>.[[Numeric]] to <emu-val>false</emu-val>.</li></ol></li></ol></li><li>Set <var>locale</var>.[[NumberingSystem]] to <var>r</var>.[[nu]].</li><li>Return <var>locale</var>.</li></ol></emu-alg>
     </emu-clause>
   </emu-clause>
 
@@ -2081,7 +2098,7 @@ <h1><span class="secnum">1.3.1</span> Intl.Locale.prototype</h1>
       <h1><span class="secnum">1.3.2</span> Internal slots</h1>
 
       <p>
-      The value of the [[RelevantExtensionKeys]] internal slot is « <emu-val>"ca"</emu-val>, <emu-val>"co"</emu-val>, <ins><emu-val>"fw"</emu-val>, </ins><emu-val>"hc"</emu-val>, <emu-val>"kf"</emu-val>, <emu-val>"kn"</emu-val>, <emu-val>"nu"</emu-val> ». If %Collator%.[[RelevantExtensionKeys]] does not contain <emu-val>"kf"</emu-val>, then remove <emu-val>"kf"</emu-val> from <emu-xref href="#sec-intl-locale-constructor" id="_ref_32"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]]. If %Collator%.[[RelevantExtensionKeys]] does not contain <emu-val>"kn"</emu-val>, then remove <emu-val>"kn"</emu-val> from <emu-xref href="#sec-intl-locale-constructor" id="_ref_33"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]].
+      The value of the [[RelevantExtensionKeys]] internal slot is « <emu-val>"ca"</emu-val>, <emu-val>"co"</emu-val>, <ins><emu-val>"fw"</emu-val>, </ins><emu-val>"hc"</emu-val>, <emu-val>"kf"</emu-val>, <emu-val>"kn"</emu-val>, <emu-val>"nu"</emu-val> ». If %Collator%.[[RelevantExtensionKeys]] does not contain <emu-val>"kf"</emu-val>, then remove <emu-val>"kf"</emu-val> from <emu-xref href="#sec-intl-locale-constructor" id="_ref_34"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]]. If %Collator%.[[RelevantExtensionKeys]] does not contain <emu-val>"kn"</emu-val>, then remove <emu-val>"kn"</emu-val> from <emu-xref href="#sec-intl-locale-constructor" id="_ref_35"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]].
       </p>
     </emu-clause>
   </emu-clause>
@@ -2116,13 +2133,13 @@ <h1><span class="secnum">1.4.2</span> Intl.Locale.prototype[ @@toStringTag ]</h1
     <emu-clause id="sec-Intl.Locale.prototype.maximize">
       <h1><span class="secnum">1.4.3</span> Intl.Locale.prototype.maximize ( )</h1>
 
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>maximal</var> be the result of the <a href="https://www.unicode.org/reports/tr35/#Likely_Subtags">Add Likely Subtags</a> algorithm applied to <var>loc</var>.[[Locale]]. If an error is signaled, set <var>maximal</var> to <var>loc</var>.[[Locale]].</li><li>Return !&nbsp;<emu-xref aoid="Construct" id="_ref_34"><a href="https://tc39.es/ecma262/#sec-construct">Construct</a></emu-xref>(<emu-xref href="#sec-intl-locale-constructor" id="_ref_35"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>, <var>maximal</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>maximal</var> be the result of the <a href="https://www.unicode.org/reports/tr35/#Likely_Subtags">Add Likely Subtags</a> algorithm applied to <var>loc</var>.[[Locale]]. If an error is signaled, set <var>maximal</var> to <var>loc</var>.[[Locale]].</li><li>Return !&nbsp;<emu-xref aoid="Construct" id="_ref_36"><a href="https://tc39.es/ecma262/#sec-construct">Construct</a></emu-xref>(<emu-xref href="#sec-intl-locale-constructor" id="_ref_37"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>, <var>maximal</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.minimize">
       <h1><span class="secnum">1.4.4</span> Intl.Locale.prototype.minimize ( )</h1>
 
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>minimal</var> be the result of the <a href="https://www.unicode.org/reports/tr35/#Likely_Subtags">Remove Likely Subtags</a> algorithm applied to <var>loc</var>.[[Locale]]. If an error is signaled, set <var>minimal</var> to <var>loc</var>.[[Locale]].</li><li>Return !&nbsp;<emu-xref aoid="Construct" id="_ref_36"><a href="https://tc39.es/ecma262/#sec-construct">Construct</a></emu-xref>(<emu-xref href="#sec-intl-locale-constructor" id="_ref_37"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>, <var>minimal</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>minimal</var> be the result of the <a href="https://www.unicode.org/reports/tr35/#Likely_Subtags">Remove Likely Subtags</a> algorithm applied to <var>loc</var>.[[Locale]]. If an error is signaled, set <var>minimal</var> to <var>loc</var>.[[Locale]].</li><li>Return !&nbsp;<emu-xref aoid="Construct" id="_ref_38"><a href="https://tc39.es/ecma262/#sec-construct">Construct</a></emu-xref>(<emu-xref href="#sec-intl-locale-constructor" id="_ref_39"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>, <var>minimal</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.toString">
@@ -2145,7 +2162,7 @@ <h1><span class="secnum">1.4.7</span> get Intl.Locale.prototype.calendar</h1>
 
     <emu-clause id="sec-Intl.Locale.prototype.caseFirst">
       <h1><span class="secnum">1.4.8</span> get Intl.Locale.prototype.caseFirst</h1>
-      <p>This property only exists if <emu-xref href="#sec-intl-locale-constructor" id="_ref_38"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]] contains <emu-val>"kf"</emu-val>.</p>
+      <p>This property only exists if <emu-xref href="#sec-intl-locale-constructor" id="_ref_40"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]] contains <emu-val>"kf"</emu-val>.</p>
       <p><code>Intl.Locale.prototype.caseFirst</code> is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps:</p>
       <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return <var>loc</var>.[[CaseFirst]].</li></ol></emu-alg>
     </emu-clause>
@@ -2172,7 +2189,7 @@ <h1><span class="secnum">1.4.11</span> get Intl.Locale.prototype.hourCycle</h1>
 
     <emu-clause id="sec-Intl.Locale.prototype.numeric">
       <h1><span class="secnum">1.4.12</span> get Intl.Locale.prototype.numeric</h1>
-      <p>This property only exists if <emu-xref href="#sec-intl-locale-constructor" id="_ref_39"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]] contains <emu-val>"kn"</emu-val>.</p>
+      <p>This property only exists if <emu-xref href="#sec-intl-locale-constructor" id="_ref_41"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref>.[[RelevantExtensionKeys]] contains <emu-val>"kn"</emu-val>.</p>
       <p><code>Intl.Locale.prototype.numeric</code> is an <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">accessor property</a></emu-xref> whose set accessor function is <emu-val>undefined</emu-val>. Its get accessor function performs the following steps:</p>
       <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return <var>loc</var>.[[Numeric]].</li></ol></emu-alg>
     </emu-clause>
@@ -2205,46 +2222,46 @@ <h1><span class="secnum">1.4.16</span> get Intl.Locale.prototype.region</h1>
     <emu-clause id="sec-Intl.Locale.prototype.getCalendars">
       <h1><span class="secnum">1.4.17</span> Intl.Locale.prototype.getCalendars ( )</h1>
       <p>When the <code>getCalendars</code> method is called, the following steps are taken:</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="CalendarsOfLocale" id="_ref_40"><a href="#sec-calendars-of-locale">CalendarsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="CalendarsOfLocale" id="_ref_42"><a href="#sec-calendars-of-locale">CalendarsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getCollations">
       <h1><span class="secnum">1.4.18</span> Intl.Locale.prototype.getCollations ( )</h1>
       <p>When the <code>getCollations</code> method is called, the following steps are taken:</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="CollationsOfLocale" id="_ref_41"><a href="#sec-collations-of-locale">CollationsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="CollationsOfLocale" id="_ref_43"><a href="#sec-collations-of-locale">CollationsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getHourCycles">
       <h1><span class="secnum">1.4.19</span> Intl.Locale.prototype.getHourCycles ( )</h1>
       <p>When the <code>getHourCycles</code> method is called, the following steps are taken:</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="HourCyclesOfLocale" id="_ref_42"><a href="#sec-hour-cycles-of-locale">HourCyclesOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="HourCyclesOfLocale" id="_ref_44"><a href="#sec-hour-cycles-of-locale">HourCyclesOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getNumberingSystems">
       <h1><span class="secnum">1.4.20</span> Intl.Locale.prototype.getNumberingSystems ( )</h1>
       <p>When the <code>getNumberingSystems</code> method is called, the following steps are taken:</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="NumberingSystemsOfLocale" id="_ref_43"><a href="#sec-numbering-systems-of-locale">NumberingSystemsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Return !&nbsp;<emu-xref aoid="NumberingSystemsOfLocale" id="_ref_45"><a href="#sec-numbering-systems-of-locale">NumberingSystemsOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getTimeZones">
       <h1><span class="secnum">1.4.21</span> Intl.Locale.prototype.getTimeZones ( )</h1>
       <p>When the <code>getTimeZones</code> method is called, the following steps are taken:</p>
       <p>The following algorithm refers to <a href="https://www.unicode.org/reports/tr35/#Identifiers">UTS 35's Unicode Language and Locale Identifiers grammar</a>.</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li>If the <code>unicode_language_id</code> production of <var>locale</var> does not contain the <code>["-" unicode_region_subtag]</code> sequence, return <emu-val>undefined</emu-val>.</li><li>Return !&nbsp;<emu-xref aoid="TimeZonesOfLocale" id="_ref_44"><a href="#sec-time-zones-of-locale">TimeZonesOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>locale</var> be <var>loc</var>.[[Locale]].</li><li>If the <code>unicode_language_id</code> production of <var>locale</var> does not contain the <code>["-" unicode_region_subtag]</code> sequence, return <emu-val>undefined</emu-val>.</li><li>Return !&nbsp;<emu-xref aoid="TimeZonesOfLocale" id="_ref_46"><a href="#sec-time-zones-of-locale">TimeZonesOfLocale</a></emu-xref>(<var>loc</var>).</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getTextInfo">
       <h1><span class="secnum">1.4.22</span> Intl.Locale.prototype.getTextInfo ( )</h1>
       <p>When the <code>getTextInfo</code> method is called, the following steps are taken:</p>
       <p>The following algorithm refers to Locale data specified in <a href="https://www.unicode.org/reports/tr35/tr35-general.html#Layout_Elements">UTS 35's Layouts Elements</a>.</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>info</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_45"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(%Object.prototype%).</li><li>Let <var>dir</var> be !&nbsp;<emu-xref aoid="CharacterDirectionOfLocale" id="_ref_46"><a href="#sec-character-direction-of-locale">CharacterDirectionOfLocale</a></emu-xref>(<var>loc</var>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_47"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"direction"</emu-val>, <var>dir</var>).</li><li>Return <var>info</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>info</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_47"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(%Object.prototype%).</li><li>Let <var>dir</var> be !&nbsp;<emu-xref aoid="CharacterDirectionOfLocale" id="_ref_48"><a href="#sec-character-direction-of-locale">CharacterDirectionOfLocale</a></emu-xref>(<var>loc</var>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_49"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"direction"</emu-val>, <var>dir</var>).</li><li>Return <var>info</var>.</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-Intl.Locale.prototype.getWeekInfo">
       <h1><span class="secnum">1.4.23</span> Intl.Locale.prototype.getWeekInfo ( )</h1>
       <p>When the <code>getWeekInfo</code> method is called, the following steps are taken:</p>
       <p>The following algorithm refers to Locale data specified in <a href="https://www.unicode.org/reports/tr35/tr35-dates.html#Date_Patterns_Week_Elements">UTS 35's Week Elements</a>.</p>
-      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>info</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_48"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(%Object.prototype%).</li><li>Let <var>wi</var> be !&nbsp;<emu-xref aoid="WeekInfoOfLocale" id="_ref_49"><a href="#sec-week-info-of-locale">WeekInfoOfLocale</a></emu-xref>(<var>loc</var>).</li><li>Let <var>we</var> be !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_50"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>wi</var>.[[Weekend]] ).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_51"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"firstDay"</emu-val>, <var>wi</var>.[[FirstDay]]).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_52"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"weekend"</emu-val>, <var>we</var>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_53"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"minimalDays"</emu-val>, <var>wi</var>.[[MinimalDays]]).</li><li>Return <var>info</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>Let <var>loc</var> be the <emu-val>this</emu-val> value.</li><li>Perform ?&nbsp;<emu-xref aoid="RequireInternalSlot"><a href="https://tc39.es/ecma262/#sec-requireinternalslot">RequireInternalSlot</a></emu-xref>(<var>loc</var>, [[InitializedLocale]]).</li><li>Let <var>info</var> be !&nbsp;<emu-xref aoid="ObjectCreate" id="_ref_50"><a href="https://tc39.es/ecma262/#sec-objectcreate">ObjectCreate</a></emu-xref>(%Object.prototype%).</li><li>Let <var>wi</var> be !&nbsp;<emu-xref aoid="WeekInfoOfLocale" id="_ref_51"><a href="#sec-week-info-of-locale">WeekInfoOfLocale</a></emu-xref>(<var>loc</var>).</li><li>Let <var>we</var> be !&nbsp;<emu-xref aoid="CreateArrayFromList" id="_ref_52"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>( <var>wi</var>.[[Weekend]] ).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_53"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"firstDay"</emu-val>, <var>wi</var>.[[FirstDay]]).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_54"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"weekend"</emu-val>, <var>we</var>).</li><li>Perform !&nbsp;<emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_55"><a href="https://tc39.es/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>info</var>, <emu-val>"minimalDays"</emu-val>, <var>wi</var>.[[MinimalDays]]).</li><li>Return <var>info</var>.</li></ol></emu-alg>
 
     </emu-clause>
     </ins>
@@ -2255,7 +2272,7 @@ <h1><span class="secnum">1.4.23</span> Intl.Locale.prototype.getWeekInfo ( )</h1
     <h1><span class="secnum">1.5</span> Properties of Intl.Locale Instances</h1>
 
     <p>
-      Intl.Locale instances are ordinary objects that inherit properties from <emu-xref href="#sec-properties-of-intl-locale-prototype-object" id="_ref_54"><a href="#sec-properties-of-intl-locale-prototype-object">%Locale.prototype%</a></emu-xref>.
+      Intl.Locale instances are ordinary objects that inherit properties from <emu-xref href="#sec-properties-of-intl-locale-prototype-object" id="_ref_56"><a href="#sec-properties-of-intl-locale-prototype-object">%Locale.prototype%</a></emu-xref>.
     </p>
 
     <p>
@@ -2273,8 +2290,8 @@ <h1><span class="secnum">1.5</span> Properties of Intl.Locale Instances</h1>
       <li><ins>[[FirstDayOfWeek]] is a String value that is a syntactically valid type value as given in <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">Unicode Technical Standard #35 Part 1 Core, Section 3.2 Unicode Locale Identifier</a>, or is <emu-val>undefined</emu-val>.</ins></li>
       <li>[[HourCycle]] is a String value that is a syntactically valid type value as given in <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">Unicode Technical Standard #35 Part 1 Core, Section 3.2 Unicode Locale Identifier</a>, or is <emu-val>undefined</emu-val>.</li>
       <li>[[NumberingSystem]] is a String value that is a syntactically valid type value as given in <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">Unicode Technical Standard #35 Part 1 Core, Section 3.2 Unicode Locale Identifier</a>, or is <emu-val>undefined</emu-val>.</li>
-      <li>[[CaseFirst]] is a String value that is a syntactically valid type value as given in <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">Unicode Technical Standard #35 Part 1 Core, Section 3.2 Unicode Locale Identifier</a>, or is <emu-val>undefined</emu-val>. This internal slot only exists if the [[RelevantExtensionKeys]] internal slot of <emu-xref href="#sec-intl-locale-constructor" id="_ref_55"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref> contains <emu-val>"kf"</emu-val>.</li>
-      <li>[[Numeric]] is a Boolean value specifying whether numeric sorting is used by the locale, or is <emu-val>undefined</emu-val>. This internal slot only exists if the [[RelevantExtensionKeys]] internal slot of <emu-xref href="#sec-intl-locale-constructor" id="_ref_56"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref> contains <emu-val>"kn"</emu-val>.</li>
+      <li>[[CaseFirst]] is a String value that is a syntactically valid type value as given in <a href="https://unicode.org/reports/tr35/#Unicode_locale_identifier">Unicode Technical Standard #35 Part 1 Core, Section 3.2 Unicode Locale Identifier</a>, or is <emu-val>undefined</emu-val>. This internal slot only exists if the [[RelevantExtensionKeys]] internal slot of <emu-xref href="#sec-intl-locale-constructor" id="_ref_57"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref> contains <emu-val>"kf"</emu-val>.</li>
+      <li>[[Numeric]] is a Boolean value specifying whether numeric sorting is used by the locale, or is <emu-val>undefined</emu-val>. This internal slot only exists if the [[RelevantExtensionKeys]] internal slot of <emu-xref href="#sec-intl-locale-constructor" id="_ref_58"><a href="#sec-intl-locale-constructor">%Locale%</a></emu-xref> contains <emu-val>"kn"</emu-val>.</li>
     </ul>
   </emu-clause>
 </emu-clause></emu-import>
@@ -2290,17 +2307,17 @@ <h1><span class="secnum">A</span> Implementation Dependent Behaviour</h1>
       In Locale:
       <ul>
         <li>
-          Support for the Unicode extensions keys <emu-val>"kf"</emu-val>, <emu-val>"kn"</emu-val> and the parallel options properties <emu-val>"caseFirst"</emu-val>, <emu-val>"numeric"</emu-val> (<emu-xref href="#sec-Intl.Locale" id="_ref_2"><a href="#sec-Intl.Locale">1.2.3</a></emu-xref>)
+          Support for the Unicode extensions keys <emu-val>"kf"</emu-val>, <emu-val>"kn"</emu-val> and the parallel options properties <emu-val>"caseFirst"</emu-val>, <emu-val>"numeric"</emu-val> (<emu-xref href="#sec-Intl.Locale" id="_ref_3"><a href="#sec-Intl.Locale">1.2.3</a></emu-xref>)
         </li>
         <ins class="block">
         <li>
-          The set of preferred calendars (<emu-xref href="#sec-calendars-of-locale" id="_ref_3"><a href="#sec-calendars-of-locale">1.1.2</a></emu-xref>), collations (<emu-xref href="#sec-collations-of-locale" id="_ref_4"><a href="#sec-collations-of-locale">1.1.3</a></emu-xref>), hour cycles (<emu-xref href="#sec-hour-cycles-of-locale" id="_ref_5"><a href="#sec-hour-cycles-of-locale">1.1.4</a></emu-xref>), numbering systems (<emu-xref href="#sec-numbering-systems-of-locale" id="_ref_6"><a href="#sec-numbering-systems-of-locale">1.1.5</a></emu-xref>), and time zones  (<emu-xref href="#sec-time-zones-of-locale" id="_ref_7"><a href="#sec-time-zones-of-locale">1.1.6</a></emu-xref>) per locale
+          The set of preferred calendars (<emu-xref href="#sec-calendars-of-locale" id="_ref_4"><a href="#sec-calendars-of-locale">1.1.2</a></emu-xref>), collations (<emu-xref href="#sec-collations-of-locale" id="_ref_5"><a href="#sec-collations-of-locale">1.1.3</a></emu-xref>), hour cycles (<emu-xref href="#sec-hour-cycles-of-locale" id="_ref_6"><a href="#sec-hour-cycles-of-locale">1.1.4</a></emu-xref>), numbering systems (<emu-xref href="#sec-numbering-systems-of-locale" id="_ref_7"><a href="#sec-numbering-systems-of-locale">1.1.5</a></emu-xref>), and time zones  (<emu-xref href="#sec-time-zones-of-locale" id="_ref_8"><a href="#sec-time-zones-of-locale">1.1.6</a></emu-xref>) per locale
         </li>
         <li>
-          The default general ordering of characters (characterOrder) within a line per locale (<emu-xref href="#sec-character-direction-of-locale" id="_ref_8"><a href="#sec-character-direction-of-locale">1.1.7</a></emu-xref>)
+          The default general ordering of characters (characterOrder) within a line per locale (<emu-xref href="#sec-character-direction-of-locale" id="_ref_9"><a href="#sec-character-direction-of-locale">1.1.7</a></emu-xref>)
         </li>
         <li>
-          The 'first' day of a week, the minimal days required in the first week of a month or year, and which days of the week are considered as part of the 'weekend', for calendar purposes, per locale (<emu-xref href="#sec-week-info-of-locale" id="_ref_9"><a href="#sec-week-info-of-locale">1.1.9</a></emu-xref>)
+          The 'first' day of a week, the minimal days required in the first week of a month or year, and which days of the week are considered as part of the 'weekend', for calendar purposes, per locale (<emu-xref href="#sec-week-info-of-locale" id="_ref_10"><a href="#sec-week-info-of-locale">1.1.10</a></emu-xref>)
         </li>
         </ins>
       </ul>
diff --git a/locale.html b/locale.html
index c1bb7ac..c2a31e6 100644
--- a/locale.html
+++ b/locale.html
@@ -112,58 +112,81 @@ <h1>WeekdayToString ( _fw_ )</h1>
         The abstract operation WeekdayToString accepts the argument _fw_ , and performs the following steps:
       </p>
       <emu-alg>
-        1. For each row of <emu-xref href="#table-locale-first-day-option-type"></emu-xref>, except the header row, in table order, do
-          1. Let _v_ be the name given in the Value column of the row.
-          1. Let _t_ be the name given in the Type column of the row.
-          1. If _fw_ is equal to _v_, return _t_.
+        1. For each row of <emu-xref href="#table-locale-first-day-option-value"></emu-xref>, except the header row, in table order, do
+          1. Let _w_ be the name given in the Weekday column of the row.
+          1. Let _s_ be the name given in the String column of the row.
+          1. If _fw_ is equal to _w_, return _s_.
         1. Return _fw_.
       </emu-alg>
 
-      <emu-table id="table-locale-first-day-option-type">
-        <emu-caption>First Day Value and Type</emu-caption>
+      <emu-table id="table-locale-first-day-option-value">
+        <emu-caption>First Day String and Value</emu-caption>
         <table class="real-table">
           <thead>
             <tr>
+              <th>Weekday</th>
+              <th>String</th>
               <th>Value</th>
-              <th>Type</th>
             </tr>
           </thead>
           <tr>
             <td>*"0"*</td>
             <td>*"sun"*</td>
+            <td>*7*</td>
           </tr>
           <tr>
             <td>*"1"*</td>
             <td>*"mon"*</td>
+            <td>*1*</td>
           </tr>
           <tr>
             <td>*"2"*</td>
             <td>*"tue"*</td>
+            <td>*2*</td>
           </tr>
           <tr>
             <td>*"3"*</td>
             <td>*"wed"*</td>
+            <td>*3*</td>
           </tr>
           <tr>
             <td>*"4"*</td>
             <td>*"thu"*</td>
+            <td>*4*</td>
           </tr>
           <tr>
             <td>*"5"*</td>
             <td>*"fri"*</td>
+            <td>*5*</td>
           </tr>
           <tr>
             <td>*"6"*</td>
             <td>*"sat"*</td>
+            <td>*6*</td>
           </tr>
           <tr>
             <td>*"7"*</td>
             <td>*"sun"*</td>
+            <td>*7*</td>
           </tr>
         </table>
       </emu-table>
     </emu-clause>
 
+    <emu-clause id="sec-string-to-weekday-value" aoid=StringToWeekdayValue>
+      <h1>StringToWeekdayValue ( _fw_ )</h1>
+      <p>
+        The abstract operation StringToWeekdayValue accepts the argument _fw_ , and performs the following steps:
+      </p>
+      <emu-alg>
+        1. For each row of <emu-xref href="#table-locale-first-day-option-value"></emu-xref>, except the header row, in table order, do
+          1. Let _s_ be the name given in the String column of the row.
+          1. Let _v_ be the name given in the Value column of the row.
+          1. If _fw_ is equal to _s_, return _v_.
+        1. Return *undefined*.
+      </emu-alg>
+    </emu-clause>
+
     <emu-clause id="sec-week-info-of-locale" aoid=WeekInfoOfLocale>
       <h1>WeekInfoOfLocale ( _loc_ )</h1>
       <p>
@@ -173,7 +196,8 @@ <h1>WeekInfoOfLocale ( _loc_ )</h1>
         1. Let _locale_ be _loc_.[[Locale]].
         1. Assert: _locale_ matches the `unicode_locale_id` production.
         1. Let _r_ be a record whose fields are defined by <emu-xref href="#table-locale-weekinfo-record"></emu-xref>, with values based on _locale_.
-        1. Let _fw_ be _loc_.[[FirstDayOfWeek]].
+        1. Let _fws_ be _loc_.[[FirstDayOfWeek]].
+        1. Let _fw_ be !StringToWeekdayValue(_fws_).
         1. If _fw_ is not *undefined*, then
           1. Set _r_.[[FirstDay]] to _fw_.
         1. Return _r_.