Fortunately we upgraded to Perl 5.14. I recommend the same to anyone considering backporting features. The only problems this has caused related to a few scripts (downloaded from CPAN in fact), that started with hard-code shebang lines such as

#!/bin/perl

In reply to Re^6: RFC: Defined-Or for before Perl 5.10 by molecules
in thread RFC: Defined-Or for before Perl 5.10 by molecules

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