docs: public static <K, V> Map<K, V> findAll(Map<K, V> self, @ClosureParams(MapEntryOrKeyValue.class)  Closure closure) {
          Map<K, V> answer = createSimilarMap(self);
          BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
          for (Map.Entry<K, V> entry : self.entrySet()) {
              if (bcw.callForMap(entry)) {
                  answer.put(entry.getKey(), entry.getValue());
              }
          }
          return answer;
      }