Well, I guess you've found a bug in the last release of a really old version of Perl. 5.6.1 dates from the first half of 2001 - George W. Bush was only president for 2.5 months (5.6.2 just fixed build issues). In seems that the bug has been fixed in the (almost) 8 years that have passed since.
You've also found a workaround for the bug.
What else do you want? Noone is going to use the time machine to travel back to 2001 and fix 5.6.1.
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