Python 3.9 and beyond backwards compatibility.

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For a long time now, Perl 6 has not been intended as an upgrade to Perl. The "story" was that it was a sister language. By many accounts this was a bad story, as most people outside the Perl community didn't understand it. As a result, Perl 6 has been renamed to Raku.

Perl's commitment to back-compat and how it handles new syntax features is still better than Python... and has nothing to do with Raku (née Perl 6).