# Functions
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返回的三个参数，依次是: cache值，是否空，错误信息.
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NOTICE!!! 如果fallback返回结果的map的value一定是float64类型.
# Constants
因为redis不能缓存空值，但是我们又会经常需要缓存空值防止频繁击穿cache 因此用一个标识存储空的值.
# Variables
NOTICE!!!.
# Structs
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ZsetAop 中，EmptyExpires 使用无效.