# Packages
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# Functions
如果值相等则删除.
如果值不相等则删除.
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如果值相等则删除.
如果值相等则新增，成功返回新增后的值，失败返回0.
如果值相等则设置.
如果值相等则新增，返回当前值.
如果值不相等则新增，返回当前值 注意：如果val==0，则会造成返回bool误判.
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min,max指分数，可设置为Math.MinInt64,math.MaxInt64.
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如果值相等则设置.
如果值不相等则设置.
# Constants
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# Structs
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创建锁.
简单访问频率限制.
自动续约锁(会话锁).
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# Type aliases
会话锁续约失败回调函数.