Serhiy Storchaka added the comment: I don't think this is a problem. For now os.O_WRONLY is os.O_WRONLY, but os.O_WRONLY|os.O_CREAT|os.O_TRUNC is not os.O_WRONLY|os.O_CREAT|os.O_TRUNC. There is an exponential number of combinations (actually infinite number if count not named bits) and you shouldn't use identity check for flags.
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