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chore: bump mathlib to 8819c75, fix breaking changes - #225

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Bump mathlib dependency to 8819c75: feat: withDensity of compositions of kernels and measures (#41192) (2026-08-25)
Previously at: cf65d43: chore: remove unnecessary set_option lines (#43077) (2026-08-24)

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The mathlib build cache is not warm for this commit. CI on this PR may
compile mathlib from source, which takes hours, instead of downloading
prebuilt oleans. Cache warming for LeanMachineLearning did not cover this commit —
open an issue at https://github.com/leanprover-community/downstream-reports/issues.

Closes #224

Failure log from the validation run: download (link expires after 1 year)


This PR bumps mathlib to an identified incompatible (first-known-bad) commit (8819c75) so you can reproduce and fix the incompatibility locally by checking out this branch.

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…f kernels and measures (#41192) (2026-08-25)
@github-actions github-actions Bot added the dependency-incompatibility-fix Fix PR for a dependency incompatibility, opened by downstream-reports label Aug 26, 2026
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Bumping mathlib to 8819c75 would break the build

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