'Where is the documentation for mongoose casting object to objectid?

I have a document where the type of field is set as an ObjectId. After some super confusing trials I realized that when doing

document.field = {"_id": ObjectId("6081c591524c4ad6686235c0"), "nosuchkey": "hello"}

mongoose will magically cat the object with the _id key into an ObjectId, as if I just did

document.field = ObjectId("6081c591524c4ad6686235c0")

but I can't find the documentation for this, or whether any such other tricks happen (I know about casting in queries, although casting for find, but not casting for aggregate with also a bit confusing). Can anyone point me in the right direction?

mongoose

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'Where is the documentation for mongoose casting object to objectid?

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