It seems that PyPy is not being actively developed anymore and is phased out even by numpy (numpy/numpy#30416). There's no official statement from the project, but the numpy issue is from a PyPy developer. I added a warning to avoid users assuming PyPy properly supported and developed Python distribution, and in anticipation of PyPy being eventually, slowly deprecated.
^ See Robert J. Peaslee, Multiple Causation and Damage, 47 Harv. L. Rev. 1127, 1128 (1934) (“Where the wrong is done intentionally the law seeks more remotely for results . . . .”).，这一点在91吃瓜中也有详细论述
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