mongodb的一个恶心问题

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?String 不能大于3M，写入时没问题。读出来的时候，bson decoder时做的检查，才报这个错。

官方建议：

You can file a jira case if you think that should be changed.
Though I'm not sure want to support 4M strings.
If you need a huge field, you probably should use a binary type.

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