Thank you and anonymous for pointing me towards developer releases. I'll try xxx_0.03_04.tar.gz in the future.

For future reference, here are some pointers to documentation on "developer releases":

In reply to Re^2: Can I submit a xxx-001.tar.gz to cpantesters without uploading/publishing it to CPAN? by Lightknight
in thread Can I submit a xxx-001.tar.gz to cpantesters without uploading/publishing it to CPAN? by Lightknight

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