igloo:
> On Sat, Oct 04, 2008 at 04:00:57PM -0700, Duncan Coutts wrote:
> > On Sat, 2008-10-04 at 15:50 -0700, Don Stewart wrote:
> > > BTW, this is why we cannot ship with the old bytestring fork of 0.9
> > > bumping around in GHC.
> > 
> > That and the not-closing-file-handles bug.
> 
> I believe I've just fixed this, but please let me know if there is more
> to it.
> 
> If the only other known issue is an unidentified performance bug (which
> isn't a regression, and may even just be due to the flags used when
> compiling or something) then I'd favour sticking with the current code
> at this point in the release. We are less likely to be bitten by unknown
> issues, API changes etc that way.

The serious performance bug is fixed in the last 4 or 5 bytestring
releases. It was due to inlining of Eq and Ord, interferring with fusion
laws. That's long been fixed, but GHC is shipping a fork of bytestring
0.9, with all that cruft.

-- Don

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