someone wanted to use new and shiny features to golf the code down a bit
The people who pay me need working Unicode. I don't have to release parts of that code so that you can use, modify, and redistribute it without paying me, but I do.
(Come to think of it, no one who's contributed to Perl itself in the past six years has charged you a penny to use it.)
Do you intend for your comments to sound condescending and insulting?
A faster regular expression engine is only good for golf? Working Unicode is only good for golf? A regular expression engine without recursion crashes is only good for golf? Memory optimizations are only good for golf? Self-recursive functions without memory leaks are only good for golf? Native casefolding is only good for golf? Fixed memory leaks are only good for golf? DoS-safe hashes are only good for golf? A working keyword extension mechanism is only good for golf?
Do you really mean to give the impression the only reason someone would use anything newer than 5.8 is because he or she thinks adding "\n" to the end of every print is onerous?