Add fromListUpsert for Map and IntMap#1190
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meooow25 merged 3 commits intohaskell:masterfrom Apr 12, 2026
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This is a little more powerful than fromListWith and also less error-prone because the type of the combining function makes it clear which value is old and which is new.
This was referenced Apr 4, 2026
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I'll merge this over the weekend if there are no concerns. |
This was referenced Apr 13, 2026
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This is a little more powerful than fromListWith and also less error-prone because the type of the combining function makes it clear which value is old and which is new.
Closes #386