Strange Behavior when using Edit Validation Pattern

I've noticed a strange interplay between edit patterns and binding data format (Numeric Field). If I set the Data Format to Integer (under Object -> Binding) I cannot enter a decimal at all (good), but if I add a numeric field edit pattern (e.g. num{zzzzzzzzzzzz9}), it will let me type anything I want, but then throws this error, which is not terribly user friendly:

So two questions:

1) Has anyone got numeric validation patterns to work? They don't seem to do anything.

2) What is the best way to ensure a user enters a whole number? I'd like to avoid scripting if possible, as most of the form designers are non technical.

Thanks!