bignum

The build tool (Build.PL/Makefile.PL) is executable. This is bad because you should specify which perl you want to use while installing.

Change the permissions of Build.PL/Makefile.PL to not-executable.

This distribution has .pm files with inconsistent versions.

Split the distribution, or fix the version numbers to make them consistent (use the highest version number to avoid version downgrade).

This distribution does not have a link to a repository in META.yml.

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).

This distribution does not 'use warnings;' (or its equivalents) in all of its modules. Note that this is not about that your modules actually warn when something bad happens. It's bad if nobody can tell if a module warns or not, without reading the source code of your favorite module that actually enforces warnings. In other words, it's bad if someone feels the need to add 'use warnings' to your modules.

Add 'use warnings' (or its equivalents) to all modules (this will require perl > 5.6), or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

This distribution does not have a list of provided modules defined in META.yml.

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.