337   int isnum;  in luaL_checknumber()  local
338   lua_Number d = lua_tonumberx(L, narg, &isnum);  in luaL_checknumber()
339   if (!isnum)  in luaL_checknumber()
351   int isnum;  in luaL_checkinteger()  local
352   lua_Integer d = lua_tointegerx(L, narg, &isnum);  in luaL_checkinteger()
353   if (!isnum)  in luaL_checkinteger()
360   int isnum;  in luaL_checkunsigned()  local
361   lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);  in luaL_checkunsigned()
362   if (!isnum)  in luaL_checkunsigned()
584   int isnum;  in luaL_len()  local
586   l = (int)lua_tointegerx(L, -1, &isnum);  in luaL_len()
587   if (!isnum)  in luaL_len()