Documentation doesn't say that the default value of flattenMaps is different between toObject and toJSON

[ozomer]

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What is the current behavior?

The documentation of Document#toJSON says: "This method accepts the same options as Document#toObject.". However, it does not say that the default value for flattenMaps in toObject is false, but in toJSON it is true:

https://github.com/Automattic/mongoose/blob/master/lib/types/map.js#L133-L161

What is the expected behavior?

Mention this fact in the documentation of toJSON. Would be nice to also mention this fact in the documentation of toObject.

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.

Mongoose 6.0.14.
NodeJS 16.13.2.