Lower minimum OS requirements

.swiftpm/xcode/xcuserdata/charlie.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -14,21 +14,21 @@
 			<key>isShown</key>
 			<false/>
 			<key>orderHint</key>
-			<integer>3</integer>
+			<integer>2</integer>
 		</dict>
 		<key>Tutorial (Playground) 2.xcscheme</key>
 		<dict>
 			<key>isShown</key>
 			<false/>
 			<key>orderHint</key>
-			<integer>4</integer>
+			<integer>3</integer>
 		</dict>
 		<key>Tutorial (Playground) 3.xcscheme</key>
 		<dict>
 			<key>isShown</key>
 			<false/>
 			<key>orderHint</key>
-			<integer>1</integer>
+			<integer>4</integer>
 		</dict>
 		<key>Tutorial (Playground) 4.xcscheme</key>
 		<dict>
@@ -49,7 +49,7 @@
 			<key>isShown</key>
 			<false/>
 			<key>orderHint</key>
-			<integer>2</integer>
+			<integer>1</integer>
 		</dict>
 	</dict>
 	<key>SuppressBuildableAutocreation</key>

Package.swift

@@ -1,12 +1,12 @@
-// swift-tools-version:5.5
+// swift-tools-version:5.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "MonadicJSON",
     platforms: [
-        .macOS(.v12), .iOS(.v15), .watchOS(.v8), .tvOS(.v15),
+        .macOS(.v10_10), .iOS(.v8), .watchOS(.v2), .tvOS(.v9),
     ],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.

Sources/MonadicJSON/JSON.swift

@@ -35,6 +35,9 @@ extension Null: Codable {
     }
 }
 
+public struct JSONDecimalError: Error {
+}
+
 public indirect enum JSON: Hashable, Codable {
     case null
     case string(String)
@@ -43,15 +46,18 @@ public indirect enum JSON: Hashable, Codable {
     case object([String: JSON])
     case array([JSON])
 
-    public func encodable() throws -> some Encodable {
+    public func encodable() throws -> Encodable {
         func recurse(json: JSON) throws -> AnyEncodable {
             switch json {
             case let .object(value):
                 return try .init(value.mapValues(recurse))
             case let .array(value):
                 return try .init(value.map(recurse))
             case let .number(value):
-                return try .init(Decimal(value, format: .number))
+                guard let decimal = Decimal(string: value) else {
+                    throw JSONDecimalError()
+                }
+                return .init(decimal)
             case let .string(value):
                 return .init(value)
             case let .bool(value):