code: func (vs *ValueMap) Equal(other *ValueMap) bool {
  	if vs == nil {
  		return other == nil || other.Len() == 0
  	}
  	if other == nil {
  		return vs == nil || vs.Len() == 0
  	}
  	return vs.hashMap.Equal(other.hashMap)
  }
docs: // Equal returns true if this ValueMap equals the other.