[erlang-questions] Multiple read and write ports to an external process

[Jeremy Ong]

I am interested in using Erlang ports for process interop. Currently,
`open_port` only seems to allow spawning communication on 1 read and 1
write port. Is there a reason we are limited to just these 2 file
descriptors? It seems like it could be advantageous to customize the fd
usage more (for example, forward errors or analytics data on fd 3). Is
there any built-in way of doing this without resorting to writing nifs?

Cheers,
Jeremy
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