Support db.collection.estimatedDocumentCount()
The home page claims "Full compatibility with current and legacy releases of MongoDB (MongoDB v3.0-4.0), so your estate is fully secure."
https://docs.mongodb.com/manual/reference/method/db.collection.estimatedDocumentCount/#db.collection.estimatedDocumentCount was introduced in v4.0.3 and works fine from the mongo shell.
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Sam Norling
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