And, although Perl5 doesn't support my $x= use ..., it does support (but doesn't document) the following rather neat trick:

    my $factory= require My::Object::Module;
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...which you shouldn't use becase that will only work if you can guanantee that you are the only one who will ever require My::Object::Module. This undocumented return value only works the first time require is called. All subsequent requireings of that modules simply return 1.

D'oh!

                - tye