docs: public static <K, V> ImmutableMapParameter<K, V> of(K k0, V v0, K k1, V v1) {
          Map<K, V> map = new HashMap<K, V>();
          putAndWarnDuplicateKeys(map, k0, v0);
          putAndWarnDuplicateKeys(map, k1, v1);
          return new ImmutableMapParameter<K, V>(map);
      }