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Lysxia
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Aug 29, 2026
| if maybe True (currentKey <) nextKey | ||
| then Just (Just currentKey) | ||
| else Nothing | ||
| {-# INLINE mapKeyO #-} |
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I don't think this is the right place for this kind of optimization.
- It's orthogonal to fixing the main issue at hand.
- When the keys are not ordered you end up paying the cost of applying
fktwice to each key, which might be expensive if it's doing nontrivial parsing. I'm also not sure this optimization is worthwhile sincemapKeysWithalready takes care of running in linear time if the mapping is monotonic.
Lysxia
reviewed
Aug 29, 2026
| assertDecodedCollidingMap :: Assertion | ||
| assertDecodedCollidingMap = decodedMap @?= Just (Map.singleton (FoldedText "a") "upper") | ||
| where | ||
| decodedMap = decode "{\"A\":\"upper\",\"a\":\"lower\"}" :: Maybe (Map FoldedText Text) |
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This test relies on KeyMap being ordered. That's why it sometimes fails the flag ordered-keymap disabled.
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|
Subsumed by #1193 |
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Fixes #1169.
Remove the unsound
"FromJSONKeyCoerce: fmap coerce"RULE.mapKeyOreuses the source tree only when mapped keys stay strictly ordered; otherwise it rebuilds the map.Tests cover reversed ordering and collisions. The full suite passes at
-O0and-O2. All 32 Map benchmarks pass the 5% regression check; affected cases are 29–41% faster.