monkeypatch unzip.Parse.emit() to emit single 'end'
monkeypatch unzip.Parse.emit() to emit single 'end'

unzip is not so well-behaved. It typically emits a 'close' event
when it's done, but there are reports that sometimes it doesn't,
and that sometimes it emits 'end' instead. Monkeypatch emit() so
that it emits just one 'end' event from any combination of 'close'
and 'end' events.

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