[issue9971] Optimize BufferedReader.readinto

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

+    Py_SAFE_DOWNCAST(READAHEAD(self), Py_off_t, Py_ssize_t)

Why downcasting the size? Can't you store the size into a Py_off_t? I suppose that sizeof(Py_off_t) >= sizeof(Py_ssize_t).

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