opt out of accursedUnutterablePerformIO

[John Wiegley]

>>>>> "DF" == David Feuer <david.feuer at gmail.com> writes:

DF> For the record, the "public" version of runRW# is called
DF> unsafeDupablePerformIO. It would be a good idea to find out if it can
DF> be used throughout bytestring without a significant penalty. If so,
DF> that would eliminate a bunch of scary stuff. If not, it would be nice
DF> to understand why.

In my tests, using unsafeDupablePerformIO instead of
accursedUnutterablePerformIO induces a 15% performance penalty.

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2