After a number of incidents, it would appear that putting the Perl version dependency into requires is just too problematic to be an appropriate solution.
It also has implications from a CPAN graph perspective. If a module has a Perl language version dependency, we can short-circuit Makefile.PL, and we can even short-circuit configure_requires, because there's simply no point bothering. So I'd like to propose a perl_version: key for META.yml, which would be specifically to identify the minimum Perl language version dependency of the module.
