"FWIW Perl4 had an aliasing feature ..."
Purely as an historical note, I do recall reading about that in the first Camel book.
In perlhist:
Perl 4 introduced the first Camel book. Really. We mostly just
switched version numbers so the book could refer to 4.000.
So that feature would have existed in Perl3.
I don't have any information on which specific Perl version introduced it.
I don't believe I used that feature in any version prior to Perl5.
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