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Based on the enum/int32 implementation for Lua, I'm in the need for an extremely fast integer -> metatable lookup on the C side.

Currently, I use 'glua_meta_nn' keys into the registry, but there must be a better way.

Could I, say, have a set of some 1000 :) virtual indices s.a. 'REGISTRYINDEX' all for my own need. I could maintain that range by myself (store table references there, in neat order) as long as it would be sure no-one else is dealing with those 'slots'.

Does Lua already provide this, or could such a range be considered for the future?