[issue36051] Drop the GIL during large bytes.join operations?

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

https://github.com/python/cpython/blob/068768faf6b82478de239d7ab903dfb249ad96a4/Objects/stringlib/join.h#L105-L126

It seems we can release GIL during iterating the buffer array.
Even though there is no one big chunk, it would be beneficial if the output size is large enough (8MB+?).

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