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Fix map difference fast path with negated left and open single key right#15508

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lukaszsamson wants to merge 1 commit into
elixir-lang:mainfrom
lukaszsamson:ls-map-difference-fix
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Fix map difference fast path with negated left and open single key right#15508
lukaszsamson wants to merge 1 commit into
elixir-lang:mainfrom
lukaszsamson:ls-map-difference-fix

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@lukaszsamson

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Opening as draft. I'm not sure this change is the right direction and if it covers all the cases it should

Fixes #15507
Assisted-by: Claude Opus 4.8 & GPT 5.5

@josevalim josevalim closed this in f70e504 Jun 19, 2026
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Map difference fast path break set algebra laws

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