[issue34302] Avoid inefficient way to find start point in deque.index

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

I'm not sure what your proposal is. Do you have a patch that increases the performance of collections.deque in some cases?  If so please share that patch, preferably as a pull request on GitHub (see <https://devguide.python.org/pullrequest/> for an explanation).

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nosy: +ronaldoussoren

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<https://bugs.python.org/issue34302>
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