FirstOrNone defined using tryHead
FirstOrNone defined using tryHead

fsprojects/FSharpx.Extras,fsprojects/FSharpx.Extras,bryanedds/FSharpx.Extras,sideeffffect/FSharpx.Extras,bryanedds/FSharpx.Extras,sideeffffect/FSharpx.Extras,bryanedds/FSharpx.Extras