Test External

Introduce `rewind` and `rewindable?` as a general concept. #266

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Run time

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Job	Run time
3.1 on ubuntu	1m 45s
3.2 on ubuntu	1m 45s
3.3 on ubuntu	1m 12s
3.1 on macos	1m 43s
3.2 on macos	1m 17s
3.3 on macos	1m 16s
	8m 58s