code: func (v VersionsFile) Equal(a VersionsFile) bool {
  	if len(v) != len(a) {
  		return false
  	}
  	for ver, iid := range v {
  		if a[ver] != iid {
  			return false
  		}
  	}
  	return true
  }
docs: // Equal returns true if version files have same entries.