> Historically, the language has been progressive in having: first-class regular expressions as /.../, value-preserving non-boolean-coercing logical operators s

> Historically, the language has been progressive in having: first-class regular expressions as /.../, value-preserving non-boolean-coercing logical operators such as || and &&, closures, polymorphism of any flavor (even multiple inheritance) through prototypes, and so much more. Perl 5 had already all those features in 2000 (Perl 5.6), or even earlier.