code: func (t *Trie) TryDelete(key []byte) error {
  	k := keybytesToHex(key)
  	_, n, err := t.delete(t.root, nil, k)
  	if err != nil {
  		return err
  	}
  	t.root = n
  	return nil
  }
docs: // TryDelete removes any existing value for key from the trie.
  // If a node was not found in the database, a MissingNodeError is returned.