Yes, of course "5" used to be part of the version. See perlhist. The change in convention was surely brought upon by Perl 6.

In reply to Re^3: If Perl 5 were to become Perl 7, what (backward-compatible) features would you want to see? by ikegami
in thread If Perl 5 were to become Perl 7, what (backward-compatible) features would you want to see? by haukex

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