Acme::CPANModules::OneAndTwoDecimalDigitsVersionTrap - Chronicle CPAN distributions which have been trapped by the one- and two decimal digits versioning scheme


This document describes version 0.002 of Acme::CPANModules::OneAndTwoDecimalDigitsVersionTrap (from Perl distribution Acme-CPANModules-OneAndTwoDecimalDigitsVersionTrap), released on 2020-01-03.


Chronicle CPAN distributions which have been trapped by the one- and two decimal digits versioning scheme.

The x.y and x.yy versioning scheme used in Perl distribution has a trap: when you release a new version by incrementing the patchlevel part into x.y.z and x.yy.z, the new version number will be less than x.y and x.yy because x.y and x.yy will numify to x.y00 and x.yy0 respectivey; while x.y.z and x.yy.z will numify to x.00y.z and x.0yy, respectively.

So if you release Acme-MyDist-0.1 (numifies to 0.100000) then Acme-MyDist-0.1.1 (0.001001), or Acme-MyDist-0.01 (0.010000) then Acme-MyDist-0.01.1 (0.001001), PAUSE will refuse to index your new version because of "decreasing version number."

This does not happen when you release Acme-MyDist-0.001 (0.001000) and then Acme-MyDist-0.001.1 (0.001001).

This thing is peculiar to Perl, and is not intuitive. Consequently, sometimes CPAN authors are not familiar with this and thus have fallen into this trap.

This list chronicles distributions which have been trapped by this.

For a bit more details, see and also version.



What are ways to use this module?

Aside from reading it, you can install all the listed modules using cpanmodules:

    % cpanmodules ls-entries OneAndTwoDecimalDigitsVersionTrap | cpanm -n

or Acme::CM::Get:

    % perl -MAcme::CM::Get=OneAndTwoDecimalDigitsVersionTrap -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

This module also helps lcpan produce a more meaningful result for lcpan related-mods when it comes to finding related modules for the modules listed in this Acme::CPANModules module.


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Source repository is at


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Acme::CPANModules - about the Acme::CPANModules namespace

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This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.