code: func (p *PublicKey) SerializeUncompressed() []byte {
  	b := make([]byte, 0, PubKeyBytesLenUncompressed)
  	b = append(b, pubkeyUncompressed)
  	b = paddedAppend(32, b, p.X.Bytes())
  	return paddedAppend(32, b, p.Y.Bytes())
  }
docs: // SerializeUncompressed serializes a public key in a 65-byte uncompressed
  // format.