Tanktalus, your tone seems to disparage my intentions. If you read my post as a request to change Perl then I was not clear, I would just like that effect. Given the nature of the problem the easiest technically correct code-fix probably is to hack the perl source and add a check and fail to where package statements are handled. That would likely be a fairly localized patch.

Collision of module names is a issue. In my code, client code is invited to partition a problem by creating sub-classes. It is very possible that the same namespace could be inadvertently reused. I am not trying to enforce the common conventions of a Good Practice(TM).

Be well, rir