I am looking for a module to assign pre and post assertions to subroutines in development and pre-production but be able to be skipped on production, and also to double as documentation (or at least facilitate documentation) of inputs and outputs.

I've found Sub::Assert which looks promising except for the documenting part (which maybe I could work in somehow) and Sub::Spec which looks interesting but not at all what I want.

Anyone know of anything useful?