code: func (alg Algorithm) Decode(signer Signer, buf []byte, obj interface{}) error {
  	return Decode(alg, signer, buf, obj)
  }
docs: // Decode decodes a serialized JWT in buf into obj, and verifies the JWT
  // signature using the Algorithm and Signer.
  //
  // If the token or signature is invalid, ErrInvalidToken or ErrInvalidSignature
  // will be returned, respectively. Otherwise, any other errors encountered
  // during token decoding will be returned.