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I was looking over the lua-5.2-work2 code and noticed that luaL_ref
ignores the first 3 indices in the table array. This assumes that the
table being worked on is the registry (because the first three indices
are the new LUA_RIDX_* values). Is this not a bad assumption as for
other tables this wastes 3 slots which could conceivably bloat memory
usage or cause keys to be in the hash part of a table (leading to
poorer performance)?

- Patrick Donnelly