code: func (d *gossipDiscoveryImpl) Lookup(PKIID common.PKIidType) *NetworkMember {
  	if bytes.Equal(PKIID, d.self.PKIid) {
  		return &d.self
  	}
  	d.lock.RLock()
  	defer d.lock.RUnlock()
  	return copyNetworkMember(d.id2Member[string(PKIID)])
  }
docs: // Lookup returns a network member, or nil if not found