luaL_opt         5979 host/minilua.c return luaL_opt(L,luaL_checkinteger,narg,def);
luaL_opt         6369 host/minilua.c e=luaL_opt(L,luaL_checkint,3,luaL_getn(L,1));
luaL_opt         6508 host/minilua.c last=luaL_opt(L,luaL_checkint,4,luaL_getn(L,1));
luaL_opt          171 lib_os.c         time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));