It is a property of document dbs, though I'm pretty sure implementations could internalize field names. Imma guess 99% of all Mongo collections ever created are

It is a property of document dbs, though I'm pretty sure implementations could internalize field names. Imma guess 99% of all Mongo collections ever created are pretty damn structured. When creating a collection, you could specify {internalize: false} or something to disable this when you do lean heavily on the schemaless behavior, but otherwise I'd like to see MongoDB take care of this.