Fix UserDefaults.double(forKey:) behavior

Author: woxtu

Sources/Foundation/UserDefaults.swift

@@ -199,6 +199,15 @@ open class UserDefaults: NSObject {
         if let bVal = aVal as? Double {
             return bVal
         }
+        if let bVal = aVal as? Bool {
+            return NSNumber(value: bVal).doubleValue
+        }
+        if let bVal = aVal as? Int {
+            return NSNumber(value: bVal).doubleValue
+        }
+        if let bVal = aVal as? Float {
+            return NSNumber(value: bVal).doubleValue
+        }
         if let bVal = aVal as? String {
             return NSString(string: bVal).doubleValue
         }

Tests/Foundation/Tests/TestUserDefaults.swift

@@ -29,6 +29,9 @@ class TestUserDefaults : XCTestCase {
 			("test_setValue_Data", test_setValue_Data ),
 			("test_setValue_BoolFromString", test_setValue_BoolFromString ),
 			("test_setValue_IntFromString", test_setValue_IntFromString ),
+			("test_setValue_DoubleFromBool", test_setValue_DoubleFromBool ),
+			("test_setValue_DoubleFromInt", test_setValue_DoubleFromInt ),
+			("test_setValue_DoubleFromFloat", test_setValue_DoubleFromFloat ),
 			("test_setValue_DoubleFromString", test_setValue_DoubleFromString ),
 			("test_volatileDomains", test_volatileDomains),
 			("test_persistentDomain", test_persistentDomain ),
@@ -235,7 +238,34 @@ class TestUserDefaults : XCTestCase {
 
 		XCTAssertEqual(defaults.integer(forKey: "key1"), 1234)
 	}
-	
+
+	func test_setValue_DoubleFromBool() {
+		let defaults = UserDefaults.standard
+
+		// Register a boolean default value. UserDefaults.double(forKey:) is supposed to return the converted Double value
+		defaults.set(true, forKey: "key1")
+
+		XCTAssertEqual(defaults.double(forKey: "key1"), 1)
+	}
+
+	func test_setValue_DoubleFromInt() {
+		let defaults = UserDefaults.standard
+
+		// Register an integer default value. UserDefaults.double(forKey:) is supposed to return the converted Double value
+		defaults.set(42, forKey: "key1")
+
+		XCTAssertEqual(defaults.double(forKey: "key1"), 42)
+	}
+
+	func test_setValue_DoubleFromFloat() {
+		let defaults = UserDefaults.standard
+
+		// Register a float default value. UserDefaults.double(forKey:) is supposed to return the converted Double value
+		defaults.set(12.34 as Float, forKey: "key1")
+
+		XCTAssertEqual(defaults.double(forKey: "key1"), Double(12.34 as Float))
+	}
+
 	func test_setValue_DoubleFromString() {
 		let defaults = UserDefaults.standard