...but it doesn't.
It took me a while to figure out what was going wrong with it, but I discovered that ti was checking against the literal locale-based string (eg "Please enter a value for {{attribute}}") rather than the string that the error would really show up as (eg "Please enter a value for Name").
I've put a fix into my shoulda branch on github along with a new macro: should_ensure_length_at_most (the opposite of the existing should_ensure_length_at_least). If you wanna just patch an existing system, I've put up a pastie of my patch here.
