code: func (hs HomesteadSigner) SignatureValues(tx *Transaction, sig []byte) (r, s, v *big.Int, err error) {
  	return hs.FrontierSigner.SignatureValues(tx, sig)
  }
docs: // SignatureValues returns signature values. This signature
  // needs to be in the [R || S || V] format where V is 0 or 1.