Test External

Introduce `rewind` and `rewindable?` as a general concept. #23

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Run time

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Job	Run time
3.1 on ubuntu	14s
3.2 on ubuntu	13s
3.3 on ubuntu	8s
3.1 on macos	14s
3.2 on macos	13s
3.3 on macos	12s
	1m 14s