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This fails when running test_import_all_consistency (sklearn/tests/test_common.py:230) when importing the Cython module sklearn.datasets._svmlight_format_fast:

ValueError: array.array size changed, may indicate binary incompatibility. Expected 72 from C header, got 24 from PyObject

This seems to be a real regression because the scheduled PyPy tests ran successfully last night on main:

https://dev.azure.com/scikit-learn/scikit-learn/_build/results?buildId=65968&view=logs&j=0b16f832-29d6-5b92-1c23-eb006f606a66&t=0cdfadab-878f-502c-9df1-54a896e98c4f

According to this message pyproj4/pyproj#854 (comment) it seems that using array.array in Cython (with PyPy in particular) is inherently problematic.