Fix preserving color space for the `Color` type (#105)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Sources/Defaults/Defaults+Bridge.swift

@@ -391,10 +391,15 @@ extension Defaults {
 }
 
 extension Defaults {
+	/**
+	The bridge which is responsible for `SwiftUI.Color` serialization and deserialization.
+
+	It is unsafe to convert `SwiftUI.Color` to `UIColor` and use `UIColor.bridge` to serialize it, because `UIColor` does not hold a color space, but `Swift.Color` does (which means color space might get lost in the conversion). The bridge will always try to preserve the color space whenever `Color#cgColor` exists. Only when `Color#cgColor` is `nil`, will it use `UIColor.bridge` to do the serialization and deserialization.
+	*/
 	@available(iOS 15.0, macOS 11.0, tvOS 15.0, watchOS 8.0, iOSApplicationExtension 15.0, macOSApplicationExtension 11.0, tvOSApplicationExtension 15.0, watchOSApplicationExtension 8.0, *)
 	public struct ColorBridge: Bridge {
 		public typealias Value = Color
-		public typealias Serializable = Data
+		public typealias Serializable = Any
 
 		#if os(macOS)
 		private typealias NativeColor = NSColor
@@ -407,16 +412,42 @@ extension Defaults {
 				return nil
 			}
 
+			guard
+				let cgColor = value.cgColor,
+				let colorSpace = cgColor.colorSpace?.name as? String,
+				let components = cgColor.components
+			else {
 				return NativeColor.bridge.serialize(NativeColor(value))
 			}
 
+			return [colorSpace, components]
+		}
+
 		public func deserialize(_ object: Serializable?) -> Value? {
+			if let object = object as? NativeColor.Serializable {
 				guard let nativeColor = NativeColor.bridge.deserialize(object) else {
 					return nil
 				}
 
 				return Value(nativeColor)
 			}
+
+			guard
+				let object = object as? [Any],
+				let rawColorspace = object[0] as? String,
+				let colorspace = CGColorSpace(name: rawColorspace as CFString),
+				let components = object[1] as? [CGFloat],
+				let cgColor = CGColor(colorSpace: colorspace, components: components)
+			else {
+				return nil
+			}
+
+			if #available(macOS 12.0, macOSApplicationExtension 12.0, *) {
+				return Value(cgColor: cgColor)
+			} else {
+				return Value(cgColor)
+			}
+		}
 	}
 }