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重归混沌 <>于2018年8月31日周五 上午9:31写道:
When I read the Lua5.4(work2) source code, change of `isvalid`( confused me.

In my opinion, `ttisnil(&G(L)->nilvalue)` is always true, `(!ttisnil(o) || o != &G(L)->nilvalue)` can be simplied to `(o != &(G)->nilvalue)`.

Of course  Roberto is always right. But I can't find my mistake.

It confused me for sereval days.  

I guess !ttisnil(o) is cheaper than o != &(G)->nilvalue .