These 2-in-1 computers upgrade the norm with touchscreen displays, 360-degree hinges, and detachable keyboards.
func (opt *Option) ArgInt64() (int64, error)，详情可参考heLLoword翻译官方下载
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The setter deduplicates by equality: if the new value == the current value, no notification fires. This works well for enums, strings, and ints, but mutating a mutable object in place and reassigning the same reference won't trigger consumers (because obj == obj is trivially True). Stick to immutable values and this isn't a concern.，推荐阅读夫子获取更多信息