If it's experimental or alpha code CPAN will ignore it if there's an underscore in the distribution name (blah-0.01_01). It'll be available through CPAN.pm but the user will need to explicitly say install A/AU/AUTHOR/blah-0.01_01.tar.gz rather than just install Blah.

In reply to Re: Is it acceptable to upload non-serious modules to CPAN? by Fletch
in thread Is it acceptable to upload non-serious modules to CPAN? by Eyck

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