+ TaskBuilder tests for ValueTask

Author: gusty

src/FSharpPlus/Extensions/ValueTask.fs

@@ -247,7 +247,7 @@ module ValueTask =
 
     /// <summary>Creates a ValueTask that ignores the result of the source ValueTask.</summary>
     /// <remarks>It can be used to convert non-generic ValueTask to unit ValueTask.</remarks>
-    let ignore (source: ValueTask<'T>) =
+    let ignore (source: ValueTask) =
         if source.IsCompletedSuccessfully then
             source.GetAwaiter().GetResult() |> ignore
             Unchecked.defaultof<_>