message: Update fast serialize limitation.
diff: @@ -140,9 +140,9 @@ extern swoole_object_array swoole_objects;
  #endif
  #endif
  -//#if PHP_VERSION_ID < 70300
  +#if PHP_VERSION_ID < 70400
  #define SW_USE_FAST_SERIALIZE 1
  -//#endif
  +#endif
  #if PHP_MAJOR_VERSION < 7
  #error "require PHP version 7.0 or later."
  