code: func (ps *peerState) forAllPeers(closure func(sp *serverPeer)) {
  	for _, e := range ps.inboundPeers {
  		closure(e)
  	}
  	ps.forAllOutboundPeers(closure)
  }
docs: // forAllPeers is a helper function that runs closure on all peers known to
  // peerState.