docs: public boolean equal(final Object o1,
                           final Object o2) {
          if ( o1 instanceof InternalFactHandle ) {
              return ((InternalFactHandle) o1).getId() == ((InternalFactHandle) o2).getId();
          }
          Object left = o1;
          final InternalFactHandle handle = ((InternalFactHandle) o2);
  
          if ( left == handle.getObject() ) {
              return true;
          } else if ( handle.getTraitType() == TraitTypeEnum.WRAPPED_TRAITABLE ) {
              return left == ( (CoreWrapper) handle.getObject() ).getCore();
          } else {
              return false;
          }
      }