You can call pipe multiple times on a single readable stream, like this:

var reader = createReadableStream();
reader.pipe(createWritableStream(1));
reader.pipe(createWritableStream(2));

which is cool. However, I am implementing a transform stream, and I'd like 
to be able to do something like this:

var transform = createTransformStream();
reader.pipe(transform);
transform.multipipe(1, writer1);  // NOT the usual pipe; args explained 
below.
transform.multipipe(2, writer2);

where the transform stream is smart enough to slow down its input if 
*either* writer1 or writer2 request to pause (i.e. return false on a call 
to write()).

The notation multipipe(n, <writer>) is meant to indicate that the two 
writers receive different streams, unlike the usual behavior of pipe in the 
first example. This is analogous to piping in bash where I have separate 
output via both stderr and stdout, like this:

$ cat afile | ./somebinary > outfile1 &> outfile2

Is there a nice way to support this functionality in the current streams 
interface?

thanks!

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