[Backport releases/v4.29.0] fix: mark levelZero, levelOne, and Level.ofNat as implicit_reducible#12743
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kim-em merged 1 commit intoreleases/v4.29.0from Mar 1, 2026
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…ucible` (#12719) This PR marks `levelZero` and `Level.ofNat` as `@[implicit_reducible]` so that `Level.ofNat 0 =?= Level.zero` succeeds when the definitional equality checker respects transparency annotations. Without this, coercions between structures with implicit `Level` parameters fail, as reported by @FLDutchmann on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency/near/576131374). 🤖 Prepared with Claude Code --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> (cherry picked from commit d59f229)
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Backport d59f229 from #12719.