[rfc] transport activity locally?

[Aaron Bentley]

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Martin Pool wrote:
> The annoying thing here is that it says all application code needs to
> know whether there's a pb and whether it should synchronize with it.
> It should be done in one place.  It's not a pressing problem but I
> find it gross.

We can make Command.outf pb-aware.  I think that would handle
everything, assuming we carefully stamped out all use of sys.stdout.

Aaron
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