[issue15958] bytes.join() should allow arbitrary buffer objects

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Attached new refleakless patch.

Your approach is dangerous, because the buffers may change size between
two calls to PyObject_GetBuffer(). I think you should keep the
Py_buffers alive in an array, and only release them at the end (it may
also be slightly faster to do so).

A nit: you are adding a lot of newlines in test_bytes.py.

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