>>> I propose we add it to System.IO. Note that we'd have to copy the 5 lines
>>> in System.Posix.IO.createPipe into base as the above implementation would
>>> otherwise depend on the unix package.
>>>
>> +1. I've needed this in the past when working with process, and ended up
>> writing POSIX-only code as a result.

+1 one from me, with a preference for process over base.

Cheers,

  Stefan