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Preserve nil values in generic type map - #1781
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dajiaohuang wants to merge 5 commits into
Closed
dajiaohuang wants to merge 5 commits into
dajiaohuang wants to merge 5 commits into
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The generic Map wrapper uses the upstream map's nil return to distinguish missing keys, so a stored nil value is reported as absent. Box values before storing them to preserve presence independently of V, including during iteration. Add a regression test for Set(key, nil), At, and Iterate.
Review update: the unrelated generic-instantiation change and its fixture were removed through a normal follow-up commit; #1764 tracks that fix separately. Current-head validation: go test ./go/types/typeutil (four tests) passed; git diff --check passed. Prior validation text above is historical unless repeated here.