How are you using Mongo? What version of the server and driver are you using?

I'm using Mongo with Meteor. The driver version is 4.11.0.

What is the feature/improvement you would like?

I would like to see Numbers cast as `bsonType: double` unless explicitly cast otherwise. Basically, I think it should mirror the mongo shell default behavior:
`The mongo shell treats all numbers as floating-point values by default` 

This has been discussed previously here: https://jira.mongodb.org/browse/NODE-3164

I think if an integer is desired, then that should be explicitly cast by the user in their application code.

What use case would this feature/improvement enable?

When trying to insert something like `1`, `1.0` or `1.00`, it will be cast as a bsonType: double.