Yeah, you right. Thanks for explanation!

About memory limit... to be fair enough, I just copy this word from `perldoc less` and add parameter for fun - I don't mean something special here. But ability to limit memory sometimes very good idea. I don't mean perl optimizations here or OS limits like `setrlimit` (because as far as I know it's impossible to handle these limits - OS just kill the process).

All you know what perl eat a lot of memory - it trade memory for speed. But user's script sometimes also trade memory for speed. All sort of caches do this. And I think it's a good to know inside script what it reach some memory limits. In this case user can set callback routine or signal handler which will empty caches, flush buffers, etc.