Ah, good point! Ok.

You'd said currently the plan is for the error callback to return true or false as to whether parsing should continue, so it's up to the caller whether this is an error or a warning. Probably we should eventually have a WARN_AT() macor to make it easier to get spec-compliant parsing. That's clearly out of scope.

I'll open a new bug about adding tests for cuesetting override handling, and we can address this there.