docs: public Object plus(final Object newValue) {
          this.replaceNode(new Closure(this) {
              public void doCall(Object[] args) {
                  final GroovyObject delegate = (GroovyObject) getDelegate();
                  delegate.getProperty("mkp");
                  delegate.invokeMethod("yield", args);
                  delegate.getProperty("mkp");
                  delegate.invokeMethod("yield", new Object[]{newValue});
              }
          });
  
          return this;
      }