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Changes between Initial Version and Version 1 of Ticket #20684, comment 3

initial	v1
1		Actually, I'd rather use some special marker rather than None -- most such attributes are essentially boolean, and None -- which is False when evaluated as a boolean -- would come to mark True, and this can be confusing.
	1	Actually, I'd rather use some special marker other than None -- most such attributes are essentially boolean, and None -- which is False when evaluated as a boolean -- would come to mark True, and this can be confusing.
2	2
3	3	I'd introduce a new constant, and call it NoValue -- probably along the lines of `class NoValue(object): pass`. Then you could write