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> Right now, I'm blindly monkeying what "coxpcall" does [1], even though 
> I'm not quite understanding what it does in the first place and why :(

It allows you to execute a protected call to functions that yield from within. So if you have function f that uses a coroutine or is used by one, you can call


and if f yields or calls someone that yields there is no problem.

The usual "pattern of use" is:


pcall = copcall
xpcall = coxpcall

-- from here you can use pcall and xpcall at will