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true
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{ "acknowledged": true, "insertedId": <UUID> }
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{ "acknowledged": true, "insertedId": true }
{ "acknowledged": true, "insertedId": "string key" }
{ "acknowledged": true, "insertedId": {"$binary": {"base64": "MTIzNA==", "subType": "10"}} }
{ "acknowledged": true, "insertedId": { "document": "key" } }