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I try to describe my question in another way.

When call luaH_newkey(, it first call 'mainpositionTV' to find the 'mp'。

If the 'isempty(gval(mp)) == true  && gnext(mp) != 0', it don't correct the chain.

What are the disadvantages if it correct the chain at this case.

Maybe for performance or other reasons?

Roberto Ierusalimschy <> 于2020年8月24日周一 下午11:11写道:

I am afraid I have not understood what you want to know.

-- Roberto