message: dispatch_func length limit
diff: @@ -405,7 +405,7 @@ int php_swoole_dispatch_func(swServer *serv, swConnection *conn, swSendData *dat
  {
  // optimization: reduce memory copy
  zdata = &args[3];
  - ZVAL_STRINGL(zdata, data->data, data->length);
  + ZVAL_STRINGL(zdata, data->data, data->length > SW_IPC_BUFFER_SIZE ? SW_IPC_BUFFER_SIZE : data->length);
  }
  if (sw_call_user_function_fast_ex(NULL, fci_cache, retval, zdata ? 4 : 3, args) == FAILURE)
  {
  