@lisroach, thanks for your PR! By analyzing the history of the files in this pull request, we identified @tiran, @benjaminp and @loewis to be potential reviewers.

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For those who arrived here like me when searching quick solution to encode dqeue object into JSON; Below code (as per documentation) shall be good enough.

from collections import deque
from json import dumps, JSONEncoder

class JSONEncoderSupportingArbitraryIterators(JSONEncoder):
    def default(self, o):
        try:
            iterable = iter(o)
        except TypeError:
            pass
        else:
            return list(iterable)
        # Let the base class default method raise the TypeError
        return JSONEncoder.default(self, o)

dumps(deque(range(10)), cls=JSONEncoderSupportingArbitraryIterators)

@lisroach are you interested in writting the tests, or may I? :)

Sorry, just realized I had this sitting for so long! @carlbordum feel free to add more tests if you think of them :)

@lisroach, should this pull request be closed based on the performance benchmarks mentioned on the bug tracker or were you still working on this change? Thanks!

This PR is stale because it has been open for 30 days with no activity.

@lisroach, are you going to follow up this PR?

Closing because of lack of response and conflicts, feel free to reopen if you want to work on this.