Modules C4/Serials/Frequency.pm and C4/Serials/NumberPattern.pm appear to have been committed in error. They dont appear called anywhere. Initial commit is a bit cryptic. Threw up errors in my test suite as package differs from filelocation. Probably should be removed.
Patch pushed. Please test and close. Added Henri-Damien to the CC list for a question - do you know what C4::Serials::Frequency and C4::Serials::NumberPattern were about?