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> Do you mean that tables, C functions, and userdata are not saved if
> they are contained in upvalues?

Yes. Numbers, strings, and booleans coul be easily saved, though.

> In other words, is there a way to write a Lua function that
> will give an "unable to dump given function" error when
> given to string.dump?

Not in 5.1.
--lhf