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

Error: Crypt::CBC, Crypt::CBC::PBKDF, Crypt::CBC::PBKDF::none, Crypt::CBC::PBKDF::opensslv1, Crypt::CBC::PBKDF::opensslv2, Crypt::CBC::PBKDF::pbkdf2, Crypt::CBC::PBKDF::randomiv

Add CONTRIBUTING(.pod|md). See https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors.