Inline::MakeMaker requires the module’s version number to be exactly of the form #.##.

    croak <<END unless $version =~ /^\d\.\d\d$/;
Invalid version '$version' for $name.
Must be of the form '#.##'. (For instance '1.23')
END

This is too restrictive to be used with some modules. Is there any reason this validation needs to be done at all? It is true there needs to be a version for the XS_VERSION_BOOTCHECK to work, but if the version number is invalid, then that will fail. So why does Inline itself need to validate the version number?