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Perl. And no, that's not just a factor of its current popularity, as the language has evolved and has regular releases.

Perl has amazing backwards compatibility, but has also solidified on much better coding practices and libraries in the last 20 years. You can still run that code from 20 years ago with a new interpreter and it will be safer and faster, or you can choose a more modern style or library and it will work just as well.

And to forestall anyone trying to bring up Perl 6 as a counterargument, unless you actually know what it is and how it interacts with Perl 5 and the community, I doubt the argument is actually saying what you think...

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