docs: public static Object find(Object self, Closure closure) {
          BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
          for (Iterator iter = InvokerHelper.asIterator(self); iter.hasNext();) {
              Object value = iter.next();
              if (bcw.call(value)) {
                  return value;
              }
          }
          return null;
      }