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Do you propose to implement all of the WIFEXITED,
WEXITSTATUS series of functions for Windows as well?
Expecting people to unpack the return value manually -
especially Windows users who won't be aware of the Unix
heritage of the format - is probably unreasonable.

If you implement the W... functions, I'm OK with this
change. Otherwise I'm -1. After all, many uses of popen are
probably to run non-portable programs anyway, so portability
is only one aspect of the issue...