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Additional environments where the system misreports the encoding to use (courtesy of Armin Ronacher & Graham Dumpleton on Twitter): upstart, Salt, mod_wsgi.
Note that for more complex applications (e.g. integrated web UIs, socket servers, sending email), round tripping to the standard streams won't be enough - what we really need is a better "source of truth" as to the real system encoding when POSIX compliant systems provide incorrect configuration data to the interpreter.