I would prefer that people learn to use and rely on their local documentation. It is simply impossible for this website - or any documentation external to your system - to accurately document what people have installed.

Do you choose Perl 5.005 as the current version? Then our does not exist!

Do you choose Perl 5.6 as the current version? Then our does exist and we get into the confusion discussed at RE (3): Should I use $ and $# ?. Either way people are relying on incorrect information.

Instead I would like to see the documentation remain at something resembling a lowest common denominator but for every page to have added to it the following:

This documentation is probably for a different version of Perl than you have. For the version of this document applicable to your system type perldoc -f open

(Where open is just an example.)