code: func (p *peerConnection) SetReceiptsIdle(delivered int) {
  	p.setIdle(p.receiptStarted, delivered, &p.receiptThroughput, &p.receiptIdle)
  }
docs: // SetReceiptsIdle sets the peer to idle, allowing it to execute new receipt
  // retrieval requests. Its estimated receipt retrieval throughput is updated
  // with that measured just now.