code: func (h Handlers) Copy() Handlers {
  	return Handlers{
  		Build:            h.Build.copy(),
  		Sign:             h.Sign.copy(),
  		Send:             h.Send.copy(),
  		ValidateResponse: h.ValidateResponse.copy(),
  		Decode:           h.Decode.copy(),
  		DecodeError:      h.DecodeError.copy(),
  		Complete:         h.Complete.copy(),
  	}
  }
docs: // Copy returns a copy of a Handlers instance.