This change looks reasonable to me, but could you explain what problem does it address? In particular, the change to the uncommonType handling.

This change looks reasonable to me, but could you explain what problem does it address? In particular, the change to the uncommonType handling.

• resolveReflectName: compatible go upstream
• uncommonType : this change for add new type with method by reflect.
  in go upstream , uncommType embed rtype and can pre allocate uncommType space. but in gopherjs uncommType allocate cannot pre allocate only check from $methodSet, so use js.InternalObject(rt).Set("uncommonType", js.InternalObject(ut)) to dynamic set enable.

see https://github.com/goplusjs/reflectx provide dynamic add new type with method by reflect.