mongo简介——BSON数据类型与它们的编号和比较顺序
TypeNumberDouble1String2Object3Array4Binary data5Object id7Boolean8Date9Null10Regular Expression11JavaScript13Symbol14JavaScript (with scope)1532-bit integer16Timestamp1764-bit integer18Min key255Max key127 两个不同类型的值相比较时，按照如下顺序决定大小[*]MinKey (internal type)
[*]Null
[*]Numbers (ints, longs, doubles)
[*]Symbol, String
[*]Object
[*]Array
[*]BinData
[*]ObjectID
[*]Boolean
[*]Date, Timestamp
[*]Regular Expression
[*]MaxKey (internal type)
当使用$type判断某个文档属性是否是MinKey时，不应使用255，应使用-1
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