Fix bug with JoinList.append.
Fix bug with JoinList.append.
bryanedds/FSharpx.Extras,bryanedds/FSharpx.Extras,fsprojects/FSharpx.Extras,sideeffffect/FSharpx.Extras,sideeffffect/FSharpx.Extras,bryanedds/FSharpx.Extras,fsprojects/FSharpx.Extras