Backwards compatibility?

Core modules need not to be written in a backaward compatible way in terms of operators they use. The core must be backward compatible wrt third party modules and existing code bases outside of itself.

I'd say most core modules are older than the // operator.

Cheers Rolf
_{(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}