Fix remote session crash, minor fixes

Sources/FileObject.swift

@@ -34,7 +34,10 @@ open class FileObject: NSObject {
             if let url = allValues[.fileURLKey] as? URL {
                 return url
             } else {
-                let path = self.path.addingPercentEncoding(withAllowedCharacters: .filePathAllowed) ?? self.path
+                var path = self.path.addingPercentEncoding(withAllowedCharacters: .filePathAllowed) ?? self.path
+                if path.hasPrefix("/") {
+                    path.remove(at: path.startIndex)
+                }
                 return URL(string: path) ?? URL(string: "/")!
             }
         }

Sources/FileProvider.swift

@@ -786,7 +786,7 @@ public extension FileProviderBasic {
     public func url(of path: String) -> URL {
         var rpath: String = path
         rpath = rpath.addingPercentEncoding(withAllowedCharacters: .filePathAllowed) ?? rpath
-        if let baseURL = baseURL {
+        if let baseURL = baseURL?.absoluteURL {
             if rpath.hasPrefix("/") {
                 rpath.remove(at: rpath.startIndex)
             }

Sources/LocalHelper.swift

@@ -126,7 +126,10 @@ public final class LocalFileMonitor {
     /// Creates a folder monitor object with monitoring enabled.
     public init?(url: URL, handler: @escaping ()->Void) {
         self.url = url
-        descriptor = open((url.absoluteURL as NSURL).fileSystemRepresentation, O_EVTONLY)
+        descriptor = url.absoluteURL.withUnsafeFileSystemRepresentation { rep in
+            guard let rep = rep else { return -1 }
+            return open(rep, O_EVTONLY)
+        }
         guard descriptor >= 0 else { return nil }
         let event: DispatchSource.FileSystemEvent = url.fileIsDirectory ? [.write] : .all
         source = DispatchSource.makeFileSystemObjectSource(fileDescriptor: descriptor, eventMask: event, queue: qq)

Sources/RemoteSession.swift

@@ -62,7 +62,9 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
     }
     
     public override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
-        if let progress = context?.load(as: Progress.self), let newVal = change?[.newKey] as? Int64 {
+        if let progress = context?.assumingMemoryBound(to: Progress.self).pointee,
+            progress.responds(to: #selector(Progress.becomeCurrent(withPendingUnitCount:))),
+            let newVal = change?[.newKey] as? Int64 {
             switch keyPath ?? "" {
             case #keyPath(URLSessionTask.countOfBytesReceived):
                 progress.completedUnitCount = newVal