what does this provide over Attribute::Types, Scalar::Properties and the interesting module Hook::WrapSub ?

Psychorigid wasn't thought to be better !
To be honest I even didn't know most of the modules you're talking about...
(I know, shame on me ;-)

However after browsing through their doc, I think I should make clear why psychorigid is different to my mind :

Psychorigid goal is to provide a way to check code without modyfing it.
I mean, there must be no difference between a code using psychorigid and a standard code.
(Ok, I'm cheating on this, as I'm modifying comments...)

What I wanted was a module that I could activate at the debugging phase to get extra checks
and desactivate before sending it to my production server
(by just adding/removing the 'use psychorigid' line...)

Anyway, thanx again for the usefull modules list...

"Only Bad Coders Code Badly In Perl" (OBC2BIP)