Improve stream error handling #49
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This PR refactors the stream error handling logic.
Since the
closeevent waits forstdin/stdout/stderrto be closed, we do not need to await them.Also, we were not listening for errors on
stdin. We now are.Also, this handles some specific error types which are piping-related better (will be better tested in the
subprocess.pipe()PR, which is coming next).Finally, this adds a few more tests.