Is there a clean way to close a stream between two muxes?

Nobody has claimed this yet.

``` node
var mux1 = multiplex(function () {

});

var mux2 = multiplex(function (stream) {
stream.on('error', function (err) {
console.log("Got error on mux2 - " + err);
});
stream.on('finish', function () {
console.log("We are finish in mux2");
});
stream.on('close', function () {
console.log("We are closed in mux2");
});
});

mux1.pipe(mux2).pipe(mux1);

var stream = mux1.createStream();
stream.on('finish', function () {
console.log("We are finish");
});
stream.on('close', function () {
console.log("We are closed");
});
stream.end();
```

If I run that code then all I get out is "We are finish". In other words, there doesn't seem to be anyway for mux2 to find out that the stream it's connected to on mux1 has ended. That seems surprising to me.

Now if I change stream.end() to stream.destroy() then I will get an error in mux2 followed by a close. I suppose that works but it's not terribly gentle. I would have expected that there is some 'clean' way to close a stream.

What am I missing? Thanks!

Start with the supplied mux1.pipe(mux2).pipe(mux1) reproduction and trace createStream(), end(), destroy(), and the finish, close, and error events in the multiplex implementation. Done means establishing and testing the supported clean stream-closing behavior between the two muxes.

Written by the indexing model from the issue text.