[b2gills]

It wasn't even stagnant for a full 10 years, let alone 20.

Perl 5.8 was released in 2002

Perl 5.10 was released in 2007

It has had a release every year since 5.12 in 2010.

The latest was 5.32 on 2020-Jun-20. (Less than a year ago.)

The book Modern Perl was first released in 2010. It's 4th edition was released in 2015.

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Even if you ignored 5.10, there is only 8 years from 5.8 to 5.12 when the yearly releases started happening.

I really don't understand how you managed to get 20 years from any of those dates.