Minor fixes to support using URL in swift-corelibs-foundation (#601)

* Respect directory status when standardizing/resolving symlinks in URL

* Use correct NSURLErrorKey declaration

Author: jmschonfeld

Sources/FoundationEssentials/Error/CocoaError.swift

@@ -171,7 +171,7 @@ extension CocoaError {
     public static func error(_ code: CocoaError.Code, userInfo: [String : AnyHashable]? = nil, url: URL? = nil) -> Error {
         var info: [String : AnyHashable] = userInfo ?? [:]
         if let url = url {
-            info["NSURLErrorKey"] = url
+            info[NSURLErrorKey] = url
         }
         return CocoaError(code, userInfo: info)
     }

Sources/FoundationEssentials/URL/URL.swift

@@ -1739,7 +1739,7 @@ public struct URL: Equatable, Sendable, Hashable {
         }
         #endif
         guard isFileURL && !fileSystemPath.isEmpty else { return self }
-        return URL(filePath: fileSystemPath.standardizingPath, directoryHint: .checkFileSystem)
+        return URL(filePath: fileSystemPath.standardizingPath, directoryHint: hasDirectoryPath ? .isDirectory : .notDirectory)
     }
 
     /// Resolves any symlinks in the path of a file URL.
@@ -1754,7 +1754,7 @@ public struct URL: Equatable, Sendable, Hashable {
         }
         #endif
         guard isFileURL && !fileSystemPath.isEmpty else { return self }
-        return URL(filePath: fileSystemPath.resolvingSymlinksInPath)
+        return URL(filePath: fileSystemPath.resolvingSymlinksInPath, directoryHint: hasDirectoryPath ? .isDirectory : .notDirectory)
     }
 
     /// Resolves any symlinks in the path of a file URL.