add to the stack of implementation notes.

  via TC when "__LeaveStreamsUnattached" is false may cause a race between

  Tor and the controller, as both attempt to attach streams to circuits.}

  {Implementation note: You can try to attachstream to a stream that

  has already sent a connect or resolve request but hasn't succeeded

  yet, in which case Tor will detach the stream from its current circuit

  before proceeding with the new attach request.}

3.13. POSTDESCRIPTOR

  Sent from the client to the server. The syntax is: