This is a better default than not having it, since it turns errors that
would be signals into error values instead. We could take these as
options but given that we currently don't I think this at the very least
improves on the status quo.
- Remove some old comments
- Fix some doc comments
- Improve some doc comments
- Unify name of the errors related to UDP packet sizes
(i.e: recv buffer too small, and message too big to send)