docs: public static <K,V> Number count(Map<K,V> self, @ClosureParams(MapEntryOrKeyValue.class) Closure<?> closure) {
          long answer = 0;
          BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
          for (Object entry : self.entrySet()) {
              if (bcw.callForMap((Map.Entry)entry)) {
                  ++answer;
              }
          }
          // for b/c with Java return an int if we can
          if (answer <= Integer.MAX_VALUE) return (int) answer;
          return answer;
      }