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I'm ok to expose posix_spawnp() as os.posix_spawnp().
Even if we expose posix_spawnp() as os.posix_spawnp(), we can still reconsider to add posix_spawnp() feature into os.posix_spawn() as an optional keyword parameter later :-) Honestly, I have no strong preference for the API. My main problem with the keyword option is the risk of name conflict if a new feature is added to posix_spawn() with a name similar to my proposed name "use_path".