Mild refactoring of taskseqinternal

Author: bartelink

src/FSharp.Control.TaskSeq/TaskSeqInternal.fs

@@ -86,7 +86,7 @@ module internal TaskSeqInternal =
 
     let empty<'T> =
         { new IAsyncEnumerable<'T> with
-            member _.GetAsyncEnumerator _ =
+            member _.GetAsyncEnumerator(_) =
                 { new IAsyncEnumerator<'T> with
                     member _.MoveNextAsync() = ValueTask.False
                     member _.Current = Unchecked.defaultof<'T>
@@ -96,7 +96,7 @@ module internal TaskSeqInternal =
 
     let singleton (value: 'T) =
         { new IAsyncEnumerable<'T> with
-            member _.GetAsyncEnumerator _ =
+            member _.GetAsyncEnumerator(_) =
                 let mutable status = BeforeAll
 
                 { new IAsyncEnumerator<'T> with
@@ -978,11 +978,13 @@ module internal TaskSeqInternal =
                 go <- step
         }
 
-        interface IDisposable with
-            override _.Dispose() =
+        interface IAsyncDisposable with
+            override _.DisposeAsync() =
                 if not (isNull _rwLock) then
                     _rwLock.Dispose()
 
+                ValueTask.CompletedTask
+
     let except itemsToExclude (source: TaskSeq<_>) =
         checkNonNull (nameof source) source
         checkNonNull (nameof itemsToExclude) itemsToExclude