为了支持类似哈希表的数据结构和像分组这样的查询操作，由LINQ创建的匿名类型必须提供稳定的哈希码。
In order to support data structures like hash tables and query operations like grouping, anonymous types created by LINQ must provide stable hash codes.
执行加载操作时，这取决于目标表的类型和其他几个属性。
It depends on the type and a few other properties of the target table while performing the loading operation.
由于表和用户数据都非常灵活，因此Lua允许我们重载这两种类型的数据的操作(不能重载其他6种类型)。
Because tables and userdata are so flexible, Lua permits you to overload operations for objects of either type. (you cannot overload the six other types.)
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