Fatalization of calling import/unimport method with argument

[jkeenan]

Per perldoc perldeprecation, we have two deprecations (actually, fatalizations) scheduled for perl-5.44 (May 2026 release). This is one of them.

=head3 Calling a missing C<import()> or C<unimport()> method with an argument

Historically calling C<import()> or C<unimport()> on any class which did
not define such a method would be silently ignored. Effectively Perl
behaved as though there was an empty method defined in the C<UNIVERSAL>
package (even when there was no such method actually defined). As of
Perl version 5.39.2 calling such a method I<with> an argument will
trigger a warning, and in Perl version 5.44 this warning will be 
upgraded to an error. (Calling such a method with no arguments at all
will always be safe.)

Category: "deprecated::missing_import_called_with_args"

This was scheduled in f1cf82e in July 2023. AFAICT we don't yet have anyone working on this, nor have we received a pull request.

Assuming we're going forward with this ... volunteers? @Leont, @ap, @leonerd (PSC) any thoughts?

[haarg]

If we want to fatalize this, we should do it as soon as possible. The initial implementation of this was an error rather than a warning, and it broke probably a triple digit number of CPAN dists. Many of those were fixed, but I expect this will still have significant fallout.

[jkeenan]

For reference, this deprecation was largely implemented by @demerphq in f1cf82e.