No documentation for relation to RFC 5322

Some of the code explicitly mentions RFC 5322.

> https://github.com/Perl-Email-Project/Email-Valid/blob/c2303a1a86f7d58e97ca137b9b1ef5d845a7a18e/xt/sayers-corpus.t

But I don't see anywhere it documented whether or not this implements the 5322 spec or how it otherwise deviates from 822.