[Haskell-cafe] containers-

Carter Schonwald carter.schonwald at gmail.com
Tue Jul 14 23:19:37 UTC 2020

Great stuff!

On Tue, Jul 14, 2020 at 4:04 PM David Feuer <david.feuer at gmail.com> wrote:

> At long last, we have released containers- The most important
> changes in this release are bug fixes for IntMap traversals:
> * Fix traverse and traverseWithKey for IntMap, which would previously
> produce invalid IntMaps when the input contained negative keys
> (Thanks, Felix Paulusma).
> * Fix the traversal order of various functions for Data.IntMap:
> traverseWithKey, traverseMaybeWithKey, filterWithKeyA, minimum,
> maximum, mapAccum, mapAccumWithKey, mapAccumL, mapAccumRWithKey,
> mergeA (Thanks, Felix Paulusma, Simon Jakobi). These now traverse in
> key order; previously they would traverse non-negative keys before
> negative keys.
> If you traverse any IntMaps, please take note of these changes.
> We also have several additions to the API:
> * Add compose for Map and IntMap (Thanks, Alexandre Esteves).
> * Add alterF for Set and IntSet (Thanks, Simon Jakobi).
> * Add Data.IntSet.mapMonotonic (Thanks, Javran Cheng).
> * Add instance Bifoldable Map (Thanks, Joseph C. Sible).
> Performance improvements of note:
> * Make (<*) for Data.Sequence incrementally asymptotically optimal
> (Thanks, David Feuer). This finally completes the task, begun in
> December 2014, of making all the Applicative methods for sequences
> asymptotically optimal even when their results are consumed
> incrementally. Many thanks to Li-Yao Xia and Bertram Felgenhauer for
> helping to clean up and begin to document this rather tricky code.
> * Speed up fromList and related functions in Data.IntSet, Data.IntMap
> and Data.IntMap.Strict (Thanks, Bertram Felgenhauer).
> * Use count{Leading,Trailing}Zeros in Data.IntSet internals (Thanks,
> Alex Biehl).
> There are also numerous documentation improvements and packaging
> updates. Please see the changelog for full details.
> Thanks to all the contributors,
> The containers team
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