++crazyinsomniac ... I would probably go just one step further and use type-globbing to simplify the subsequent function call - For example ...

*{'is_contact_female?'} = sub {
    my @args = @_;
    ...
};

&{'is_contact_female?'}( @args );
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I first encountered this manner of subroutine assignment in Damian Conway's selfGOL obfuscation, a "must-read" for any aspiring obfuscator.