code: func (privKey PrivKeyEd25519) Equals(other PrivKey) bool {
  	if otherEd, ok := other.(PrivKeyEd25519); ok {
  		return subtle.ConstantTimeCompare(privKey[:], otherEd[:]) == 1
  	} else {
  		return false
  	}
  }
docs: // Equals - you probably don't need to use this.
  // Runs in constant time based on length of the keys.