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subprocess.Popen(args, shell=shell) is implicitly inconsistent on Unix:
 1. when shell=False, the args should be a list or you'll lose program options
 2. when shell=True, the args should be a string or your program options will be passed to shell itself
I propose to make consistent behaviour - require args to be a list, and pass shell options in a separate shell_args keyword argument. If it not for python4, then perhaps it can be implemented in PopenShell() and PopenSystem() functions.
This will also require unification of behaviour across platforms.