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Do you think it would be possible to add a function
capture' :: IO a -> IO (String, a)
that captures both stdout and stderr?
Example of usage:
>>> capture' (hPutStr stdout "foo" >> hPutStr stderr "bar" >> hPutStr stdout "baz")
hSilenceMany :: [Handle] -> IO a -> IO a
hCaptureMany :: [Handle] -> IO a -> IO (String, a)
Renamed *Many to just *