code: @SuppressWarnings("unchecked")
      public Object getThirdKeyPart() {
          Object keyPart = null;
          if (this.key.value() instanceof List && ((List<Object>) this.key.value()).size() > 1) {
              keyPart = ((List<Object>) this.key.value()).get(2);
          }
          return keyPart;
      }
docs: Return the third key part of the {@link MultitonKey} if any or null.
  
  @return Returns the third key part or null.