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 images are also cached by the browser, so you may need to empty the cache before you see the 'correct' image for your permissions.
图片同样也被浏览器缓存了下来，因此你可能需要在看到权限对应的'正确'图片之前清除浏览器的缓存。
If empty an in-memory cache will be used for some features and a temporary disk cache will be used for others.
如果此项为空，某些功能将使用内存缓存，多数功能将使用临时的磁盘缓存。
If empty an in-memory cache will be used for some features and a temporary disk cache will be used for others.
如果此项为空，某些功能将使用内存缓存，多数功能将使用临时的磁盘缓存。
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