It's in perlpolicy.

I'd also like to point out that both 5.6 and 5.8 are both hopelessly outdated, one should look at 5.12 or 5.14 instead.

Perl 6 - second systems done right

In reply to Re^2: compatibility between 5.8 and 5.6 by moritz
in thread compatibility between 5.8 and 5.6 by aravindt

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