code: func (m *BindMeta) isStale(other *BindMeta) bool {
  	return m.OriginalSQL == other.OriginalSQL && m.Db == other.Db &&
  		m.UpdateTime.Compare(other.UpdateTime) <= 0
  }
docs: // isStale checks whether this BindMeta is stale compared with the other BindMeta.