Fails with NotEnough error in arbitrary parsing functions

[joshtriplett]

As far as I can tell, when cbor_event deserializes from a BufRead instance, it only calls fill_buf when calling get (and then only once), not when calling advance. So, any arbitrary parsing function may potentially return a NotEnough error in the middle of its parsing, requiring any higher-level protocol parsing built atop that to handle any parsing function failing with NotEnough and retry after fetching more data.

[NicolasDP]

Thanks for your contributions and looking into this repo. I'll be looking at them this week.