> Yuya, it had passed tests for me with cbor, so is that a portability issue?
I don't think it's a portability issue. `cbor.load(StringIO(''))` doesn't
raise EOFError.
> One of the benefits of pickle/marshal is that we don't lose information,
> like when tuples become lists. That would be an insidious problem for callers.
Good point.
> Also, in case it wasn't obvious, we'll need another patch to add some
> handling of len(dumps(result)) > PIPE_BUF (which was an existing issue).
Yup. A payload was much smaller than PIPE_BUF, but that's no longer true.
The most straightforward fix will be to create pipe per worker and select()
them. I don't know if there's a simpler mechanism. DGRAM socket can ensure
message boundaries, but it's still has a size limit.
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