27 Apr
2016
27 Apr
'16
3:19 a.m.
On Tue, Apr 26, 2016, at 15:03, David Feuer wrote:
Way back when, Shachaf Ben-Kiki suggested an efficient implementation of `at` for Data.Map in https://mail.haskell.org/pipermail/libraries/2013-May/019761.html but that was never approved for inclusion.
Funny thing, I just tried doing that not to long ago with `at`: https://github.com/haskell/containers/pull/192 In the end, the results were mixed. It was a small optimization in some situations, and a moderate pessimization in others (esp. when the Functor becomes too complex for GHC to optimize). -- RF