Py23 proposal: Update plan for py provider fields #156
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I don't like the way I was going to add extra provider fields to report better error messages. This updates the doc to say we're not committed to any particular approach. But I think in practice I'll probably do warning messages when a py2-only or py3-only library is depended on by any other py library that's not also py2-only or py3-only respectively. Then when py_binary fails due to version conflicts, it'll direct users to check the log, e.g. by repeating the build with --output_filter.