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   there're 2 new questions confusing me:
   1.what's the difference between luaC_barrierf and luaC_barrierback? i know both of them are used to keep the invariant, but why are there 2 functions? both of them, there is an assert "lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);",   i know the GCPause statu is unbreakable, but it's not true for GCSfinalize, so why we can assert it here?
   thanks very much~~