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How often you see EXIT_SUCCESS and EXIT_FAILURE in C code besides GNU tools that should support VMS? And even GNU tools usually use multiple error codes for different kinds of errors.
I think that these constants are rather unusual for C programmers.
I'm only -0 on adding these constants, not -1, because I'm sure they will be never used. But this will add a burden on the documentation and will confuse inexperienced users when they unexpectedly encounter with sys.exit(sys.EXIT_FAILURE) instead of sys.exit(1).