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Would be great if %% would return not only the stdout but also stderr and status code. Also, it seems %% is broken in that it terminates commands too early. I tried to use it with tar and ended up with empty or broken archives while % works fine, but writes all output to stdout.
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regarding the api, how about giving the return value a lazy member stderr for the error stream and a blocking member for the status code. Maybe it would be cleaner to make the stdout a member rather than the return value itself, too, but that may have other api implications I am not aware of. Never used the piping.
yeah seems reasonable. Some kind of structured data would be nice. The whole lazy-vs-strict thing is kinda still in flux; right now most things are strict, so we could make this strict as well and figure out how to make lazy things lazy later if we decide we care