clean up additional properties observation comments

Author: chloe-yeo

Sources/FoundationEssentials/ProgressManager/ProgressManager.swift

@@ -26,9 +26,8 @@ internal import _FoundationCollections
 @Observable public final class ProgressManager: Sendable {
 
     internal let state: Mutex<State>
-    internal let additionalPropertiesSink: Void // method 1
-    internal static let additionalPropertiesKeyPath: Mutex<KeyPath<ProgressManager, Void>> = Mutex(\ProgressManager.additionalPropertiesSink) // granular support: keypath synthesis
-    // view debugger in SwiftUI: show that keypath, name it a bit more close to its functionality
+    internal let additionalPropertiesSink: Void
+    internal static let additionalPropertiesKeyPath: Mutex<KeyPath<ProgressManager, Void>> = Mutex(\ProgressManager.additionalPropertiesSink)
 
     /// The total units of work.
     public var totalCount: Int? {
@@ -199,25 +198,7 @@ internal import _FoundationCollections
     internal func mutateObservation<T>(of keyPath: KeyPath<ProgressManager, T>, _ mutation: () -> Void) {
         _$observationRegistrar.withMutation(of: self, keyPath: keyPath, mutation)
     }
-    
-    // bad performance
-//    internal subscript(fakeKeypath fake: MetatypeWrapper<Int, Int>) -> Void {
-//        _$observationRegistrar.access(self, keyPath: \.[fakeKeypath: fake])
-//    }
-    
-    //MARK: Internal vars to make additional properties observable
-//    internal var totalFileCount: Int {
-//        _$observationRegistrar.access(self, keyPath: \.totalFileCount)
-//        return getUpdatedFileCount(type: .total)
-//    }
-//    
-//    internal var completedFileCount: Int {
-//        _$observationRegistrar.access(self, keyPath: \.completedFileCount)
-//        return getUpdatedFileCount(type: .completed)
-//    }
-    
-    
-    
+
     //MARK: Fractional Properties Methods
     internal func getProgressFraction() -> ProgressFraction {
         return state.withLock { state in