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The environment system is a powerful new feature for Lua. It seems to me that the globals table accessible through LUA_GLOBALSINDEX is just a special case of the environment table - unless I am mistaken, LUA_GLOBALSINDEX simply refers to the environment table that was created for the first Lua state. If I'm wrong, disregard the rest of this message.

Perhaps LUA_GLOBALSINDEX is unnecessary. lua_getglobal and lua_setglobal could be redirected to access LUA_ENVIRONINDEX instead of LUA_GLOBALSINDEX. Most global variable access should go to the environment table anyway, so lua_getglobal and lua_setglobal would be more useful if they want to the environment table. Other functions that use LUA_GLOBALSINDEX should probably go to LUA_ENVIRONINDEX as well.

Can anybody think of a use for LUA_GLOBALSINDEX over LUA_ENVIRONINDEX?

Is there anything that this change would break?

Is LUA_GLOBALSINDEX already being retired?

Tim Maxwell