luaV_lessthan
case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i))
LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);