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It seems all of the metamethods retain a strong reference, which is causing me problems trying to use proxy objects. Is there a specific reason they're a strong reference? It seems to be this line that makes them all strong:

ltm.c: 39
  for (i=0; i<TM_N; i++) {
    G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
    luaS_fix(G(L)->tmname[i]);  /* never collect these names */

What would be the implications of removing this luaS_fix on the metamethods?