doc(peer) add TODO

TODO ensure correctness at ID generation and enforce this by only exposing functions that generate IDs safely. Then any peer.ID type found in the codebase is known to be correct.

peer/peer.go

@@ -115,6 +115,11 @@ type peer struct {
 }
 
 // String prints out the peer.
+//
+// TODO(brian): ensure correctness at ID generation and
+// enforce this by only exposing functions that generate
+// IDs safely. Then any peer.ID type found in the
+// codebase is known to be correct.
 func (p *peer) String() string {
 	pid := p.id.String()
 	maxRunes := 12