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Georges Racinet authored
apart from the usual str/bytes dance in subprocesses and I/O, (we can assume that hg and docker exec outputs are essentially ASCII, can be handled by the default UTF-8 codec or that we'd write something dedicated otherwise), the notable thing is that we need inner fixture generator to become a context manager, because something in teardowns catches StopIteration too early and raises RuntimeError. This is cleaner anyway.
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