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> The bit about given an acceptable index is a precondition for the
> entire sentence, none of the rest of it has any meaning if you don't
> supply an acceptable index.
> I'm going to say it again because it seems like it's not getting through.
> "If the value at the given acceptable index" explicitly implies that
> you've given an acceptable index to the function. Reading into the
> rest of the sentence serves no purpose because you have not met this
> precondition.

OK lets play this game. The full sentence is "If the value at the
given acceptable index is a full userdata, returns its block address."
Ok now the rest of the passage of text does not require an acceptable
index according to my English, although I _assume_ it also applies to
light user data :)