From 0d75c1768732e641139b020cada1ce14678e77a5 Mon Sep 17 00:00:00 2001
From: "Kyle E. Mitchell" <kyle@kemitchell.com>
Date: Thu, 6 Jul 2023 15:38:29 -0700
Subject: [PATCH 1/3] Add GFDL range tests to README

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 76c8b38..0cbc6f2 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,10 @@ assert(satisfies('GPL-2.0', 'GPL-2.0+'))
 assert(satisfies('GPL-2.0-only', 'GPL-2.0+'))
 assert(satisfies('GPL-2.0', 'GPL-2.0-or-later'))
 
+assert(satisfies('GFDL-1.1-invariants-or-later', 'GFDL-1.2-invariants-only'))
+assert(satisfies('GFDL-1.1-invariants-or-later', 'GFDL-1.2-invariants-or-later'))
+assert(!satisfies('GFDL-1.1-invariants-only', 'GFDL-1.2-invariants-or-later'))
+
 assert(!satisfies(
   'GPL-2.0',
   'GPL-2.0+ WITH Bison-exception-2.2'

From 4c14905255a1ad83698838bbeffa2440753de77f Mon Sep 17 00:00:00 2001
From: "Kyle E. Mitchell" <kyle@kemitchell.com>
Date: Thu, 6 Jul 2023 15:38:44 -0700
Subject: [PATCH 2/3] Don't normalize away range suffixes for GFDLs

---
 index.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 0fd51df..3e97de8 100644
--- a/index.js
+++ b/index.js
@@ -61,11 +61,12 @@ var licensesAreCompatible = function (first, second) {
 function normalizeGPLIdentifiers (argument) {
   var license = argument.license
   if (license) {
+    var isGFDL = startsWith(license, 'GFDL-')
     if (endsWith(license, '-or-later')) {
-      argument.license = license.replace('-or-later', '')
+      if (!isGFDL) argument.license = license.replace('-or-later', '')
       argument.plus = true
     } else if (endsWith(license, '-only')) {
-      argument.license = license.replace('-only', '')
+      if (!isGFDL) argument.license = license.replace('-only', '')
       delete argument.plus
     }
   } else if (argument.left && argument.right) {
@@ -75,6 +76,14 @@ function normalizeGPLIdentifiers (argument) {
   return argument
 }
 
+function startsWith (string, substring) {
+  return string.substring(0, substring.length) === substring
+}
+
+if (!startsWith('applesauce', 'apple')) {
+  throw new Error('bad impl')
+}
+
 function endsWith (string, substring) {
   return string.indexOf(substring) === string.length - substring.length
 }

From 2617c21bdbc22f47b50dc4a02ba6ec552b6130a0 Mon Sep 17 00:00:00 2001
From: "Kyle E. Mitchell" <kyle@kemitchell.com>
Date: Tue, 3 Oct 2023 11:06:36 -0700
Subject: [PATCH 3/3] Implement `startsWith` via `indexOf`

---
 index.js | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/index.js b/index.js
index 3e97de8..d3023f4 100644
--- a/index.js
+++ b/index.js
@@ -77,11 +77,7 @@ function normalizeGPLIdentifiers (argument) {
 }
 
 function startsWith (string, substring) {
-  return string.substring(0, substring.length) === substring
-}
-
-if (!startsWith('applesauce', 'apple')) {
-  throw new Error('bad impl')
+  return string.indexOf(substring) === 0
 }
 
 function endsWith (string, substring) {