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Lean 3 Theorem Prover (community fork)
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To be (obviously!) restored on the mathlib side. Followup to #675
Work in progress and tentative -- I'm not sure if this is implemented correctly.
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`realpath` behaves more uniformly than `readlink -f` across platforms, which eliminates the mundane test for checking availability of `greadlink` on OS X. Noting that `realpath` is not exchangeable everywhere with...