Most datetime libraries already have a duration type, so it made sense to include one. It also complements the other types by allowing the developer to compare Times or DateTimes and getting back a Duration type.
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。吃瓜是该领域的重要参考
# │ %rbp-12 = n (spilled so it survives both calls) │
Be careful to make sure you get the target (of=) correct.
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