336   int isnum;  in luaL_checknumber()  local
337   lua_Number d = lua_tonumberx(L, narg, &isnum);  in luaL_checknumber()
338   if (!isnum)  in luaL_checknumber()
350   int isnum;  in luaL_checkinteger()  local
351   lua_Integer d = lua_tointegerx(L, narg, &isnum);  in luaL_checkinteger()
352   if (!isnum)  in luaL_checkinteger()
359   int isnum;  in luaL_checkunsigned()  local
360   lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);  in luaL_checkunsigned()
361   if (!isnum)  in luaL_checkunsigned()
583   int isnum;  in luaL_len()  local
585   l = (int)lua_tointegerx(L, -1, &isnum);  in luaL_len()
586   if (!isnum)  in luaL_len()