code: func (lsi *LastSignedInfo) saveSigned(height int64, round int, step int8,
  	signBytes []byte, sig []byte) {
  
  	lsi.Height = height
  	lsi.Round = round
  	lsi.Step = step
  	lsi.Signature = sig
  	lsi.SignBytes = signBytes
  }
docs: // Persist height/round/step and signature