Re: [filesystem-api] Observable is not appropriate for directory listing; async iterable would be better (#4)

Inclined to agree I/O will be the likely bottleneck here. Also agree that we should rely on performance data. Probably worth measuring perf in our use case rather than extrapolating from data collected in different use cases. Should be easy to confirm that all those Promise allocations are indeed chewed up efficiently by V8 during a directory walk. Otherwise GCs could detract from framerate as well. Do you think a directory walk in Node with AsyncIterator vs. Observable would be a reasonable test? 

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