If the order property is not numeric, then results should be sorted lexically.
如果排序属性不是数字，那么结果应该按照字典次序排序。
That's because variables specified in a closure's use keyword are lexically scoped.
这是因为在closure的关键字use中指定的变量在词法上确定范围。
Lexically scoped variables refer to the local environment in which they were defined.
在词法上确定范围是指在本地环境中定义变量。
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