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Support top-level enum definitions #327

Job	Run time
oldschool (centos, 7, python-debug, debug)	4m 55s
ubuntu (20.04)	22m 22s
windows (win64_mingw73, 3.10, 5.12.*, x64)	6m 19s
ubuntu (22.04)	17m 25s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 52s
macOS (11, 3.6, 5.9.*, release)	15m 7s
oldschool (centos, 7, python-debug, release)	5m 16s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 22s
macOS (11, 3.6, 5.9.*, debug)	6m 23s
oldschool (rockylinux, 9, python3-devel, release)	4m 21s
macOS (12, 3.11, 5.12.*, debug)	5m 32s
	1h 38m 54s

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