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feat: some unification hints#12341

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leodemoura wants to merge 3 commits intomasterfrom
missing_hints
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feat: some unification hints#12341
leodemoura wants to merge 3 commits intomasterfrom
missing_hints

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@leodemoura leodemoura commented Feb 6, 2026

This PR adds a few unification hints that we will need after backward.isDefEq.respectTransparency is true by default.

See #12338
It was part of #12179.

This PR adds a few unification hints that we will need after
`backward.isDefEq.respectTransparency` is `true` by default.
@leodemoura leodemoura added the fast-ci Forces the use of large runners so that e.g. PR releases are created faster label Feb 6, 2026
@leodemoura leodemoura disabled auto-merge February 6, 2026 08:30
@github-actions github-actions bot added the toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN label Feb 6, 2026
mathlib-nightly-testing bot pushed a commit to leanprover-community/batteries that referenced this pull request Feb 6, 2026
@github-actions github-actions bot added the mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN label Feb 6, 2026
mathlib-nightly-testing bot pushed a commit to leanprover-community/mathlib4-nightly-testing that referenced this pull request Feb 6, 2026
leanprover-bot added a commit to leanprover/reference-manual that referenced this pull request Feb 6, 2026
@leanprover-bot leanprover-bot added the builds-manual CI has verified that the Lean Language Reference builds against this PR label Feb 6, 2026
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leanprover-bot commented Feb 6, 2026

Reference manual CI status:

@mathlib-lean-pr-testing mathlib-lean-pr-testing bot added the breaks-mathlib This is not necessarily a blocker for merging: but there needs to be a plan label Feb 6, 2026
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To check I understand here; unif_hint provides a way to say "foo and mk are irreducible, but the defeq foo (mk x) = x is still usable reducibly"?

Has this always been the case? I can think of a lot of places in mathlib that could benefit from this.

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breaks-mathlib This is not necessarily a blocker for merging: but there needs to be a plan builds-manual CI has verified that the Lean Language Reference builds against this PR changelog-library Library fast-ci Forces the use of large runners so that e.g. PR releases are created faster mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN

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