Preserve static map domains with none values - #15855
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Map domain entries are optional, so an empty static value excludes keys in that domain instead of making the whole map empty. Preserve those static lower bounds and cover their use in contravariant function arguments. Assisted-by: Codex:GPT-5
josevalim
approved these changes
Sep 5, 2026
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Map domain entries are optional, so an empty static value excludes keys in that domain instead of making the whole map empty. Preserve those static lower bounds and cover their use in contravariant function arguments.
Note "map hoists dynamic" tests needed update as it asserted on static part precision loss.
Fixes #15854
Assisted-by: GPT-5.6 Sol