Method remove

guava/src/com/google/common/collect/Maps.java:4096–4109

(@Nullable Object o)

    }

    @Override
    public boolean remove(@Nullable Object o) {
      try {
        return super.remove(o);
      } catch (UnsupportedOperationException e) {
        for (Entry<K, V> entry : map().entrySet()) {
          if (Objects.equals(o, entry.getValue())) {
            map().remove(entry.getKey());
            return true;
          }
        }
        return false;
      }
    }

    @Override
    public boolean removeAll(Collection<?> c) {