Update Unmanaged+Extension (#262)

Author: Kyle-Ye

Sources/OpenSwiftUICore/Data/Property/PropertyList.swift

@@ -145,14 +145,14 @@ private func find<Key: PropertyKey>(
         return nil
     }
     repeat {
-        guard keyFilter.match(element.flatMap(\.keyFilter)) else {
+        guard keyFilter.match(element.map(\.keyFilter)) else {
             return nil
         }
         if let before = element.map(\.before),
             let result = find(before, key: key, keyFilter: keyFilter) {
             return result
         }
-        if element.flatMap(\.keyType) == Key.self {
+        if element.map(\.keyType) == Key.self {
             return element.map { $0 as? TypedElement<Key> }
         }
         guard let after = element.map(\.after) else {

Sources/OpenSwiftUICore/Data/Property/Unmanaged+Extension.swift

@@ -0,0 +1,31 @@
+//
+//  Unmanaged+Extension.swift
+//  OpenSwiftUICore
+//
+//  Audited for iOS 18.0
+//  Status: Complete
+
+extension Unmanaged {
+    @_transparent
+    package func map<T>(_ transform: (Instance) -> T) -> T {
+        _withUnsafeGuaranteedRef { transform($0) }
+    }
+
+    @_transparent
+    package func map<T>(_ transform: (Instance) -> T) -> Unmanaged<T> where T: AnyObject {
+        _withUnsafeGuaranteedRef { .passUnretained(transform($0)) }
+    }
+
+    @_transparent
+    package func map<T>(_ transform: (Instance) -> T?) -> Unmanaged<T>? where T: AnyObject {
+        _withUnsafeGuaranteedRef { transform($0).map { .passUnretained($0) } }
+    }
+
+    package static func == (lhs: Unmanaged<Instance>, rhs: Unmanaged<Instance>) -> Bool {
+        lhs.toOpaque() == rhs.toOpaque()
+    }
+
+    package static func != (lhs: Unmanaged<Instance>, rhs: Unmanaged<Instance>) -> Bool {
+        lhs.toOpaque() != rhs.toOpaque()
+    }
+}