NullFieldStrategy interface should have a reference to client\server provided value

And it affects all previous versions. My case is that I should accept blank inputs from the client through text fields. By blank inputs I mean "nothing" and one or more spaces.

Now the NullFieldStrategy interface doesn't provide a clue about the value considered by tapestry to be blank. Like in my case, I actually need to know if the user provided a space or more or even nothing at all ? I just need the value as it is.

Thank you.