Improving Data.Char.isSpace performance

[John MacFarlane]

+++ Simon Peyton-Jones [Oct 29 12 22:29 ]:
> Sounds good to me.  Thanks for doing this.
> 
> When you think you are ready, just submit a patch.  (As others have noted, maybe isSpace isn't the only function that could benefit from this kind of attention.)

Yes, if the general idea is agreeable, I'll do some of the other
functions in GHC.Unicode as well, and provide benchmarks for them
as well.