The amount of bandwidth consumed by full mode, particularly when the browser cache is empty, makes it a less-than-ideal experience on mobile devices where the bandwidth might be constrained.
full模式所使用的带宽量(特别是浏览器缓存为空的情况下)对于带宽比较有限的移动设备来说，无法得到理想的使用体验。
Since the result for the empty array case will always be the same, it would make sense to cache the Task representing the empty array.
因为对于空数组结果总会是一样的，所以缓存代表空数组的Task就很合理。
The solution is to clear or empty your browser's cache .
解决办法是清除或者清空你的浏览器的高速缓冲存储。
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