CaseInsensitive type

[Richard Wallace]

Any objections to me adding a CaseInsensitive[1] type to scalaz-core?
It's a direct port of the Haskell version[2]. It's really useful for
when you want to use strings as map keys and sets without
case-sensitivity.

Rich

[1] http://paste.pocoo.org/show/555790/
[2] http://hackage.haskell.org/package/case-insensitive-0.4.0.1

[Runar Bjarnason]

That would be awesome.

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[Tony Morris]

Looks good. I notice you don't have the map function. Maybe you could
instance Functor for a general case and write a mapf method that uses
the FoldCase restriction in the type? Dunno, leave that up to you -- but
no objections here -- do it.

--
Tony Morris
http://tmorris.net/

[Richard Wallace]

Done [1]. I cleaned it up a bit, added map - although I couldn't
figure out a way to implement a Functor instance without completely
violating the invariants.

Rich

[1] https://github.com/scalaz/scalaz/commit/b74821aa912ec3ac7871a6e1f106176038b402b4

[Tony Morris]

Yeah maybe it's not a functor after all. Cheers mate.