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>> could a conforming implementation have them be yieldable?

>> (Also why are they not yieldable in the reference implementation?)
> It does not seem to be a good cost-benefit approach. Making them yieldable will probably make them more complex and slower in the "normal" case.

I'm curious as to what changes at the C level are required to make them yieldable. For example, is it possible to make Lpeg handling of callback functions (Cmt and /func) yieldable?