code: func NewOneToOneEnvelope(size int, alerter gendiodes.Alerter) *OneToOneEnvelope {
  	return &OneToOneEnvelope{
  		d: gendiodes.NewPoller(gendiodes.NewManyToOne(size, alerter)),
  	}
  }
docs: // NewManyToOneEnvelope returns a new ManyToOneEnvelope diode to be used with
  // many writers and a single reader.