code: func (n *NamespacedKV) PutTime(key string, val time.Time) {
  	valBs, _ := val.MarshalBinary() // never returns an error
  	n.db.Put(n.prefixedKey(key), valBs, nil)
  }
docs: // PutTime stores a new time.Time. Any existing value (even if of another
  // type) is overwritten.