Don't install (nor run) mypy on PyPy (librt build failures) #187
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This was referenced Dec 20, 2025
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The latest reason is that librt, a new mypy dependency used for their new cache, doesn't build on PyPy.
But it's not the first time mypy can't be run on PyPy and it's not like running static type checking on PyPy actually brings anything other than wasting time. So I used a more generalized explanation so we're not tempted to remove the install exclusion.