Allow fields to be excluded from automatic typing

[chris-steele]

Feature description

On insert/update data will be parsed for strings that match ObjectIds. This is not always desirable, for example _friendlyId is defined as a string by its schema not an ObjectId. Is there a way to work around this?

This also leads to a question: should this module be mutating data at all given that the function of validation/sanitisation is handled by jsonschema?

[taylortom]

The reason we have parsing for ObjectId strings is that mongo simply will not work with a combination of strings & ObjectIds - the DB operations will not work as expected.

Why do we not want _friendlyIds to be parsed as ObjectIds?