Thank you for the new version.

Release notes:
> There are no breaking changes in this release.

There is a breaking change. It is mentioned in "Change Log v1.4.1-Bson.txt":
BsonDocument.cs
changed SetDocumentId to assume Id is already of type BsonValue

Thus, when I call it with `int`, as I used to, then I get the exception:
Unable to cast object of type 'System.Int32' to type 'MongoDB.Bson.BsonValue'.

The method `SetDocumentId(object id)` is confusing now. It accepts `object id` but internally does:
var idBsonValue = (BsonValue)id;

This is unsafe and even not documented in code comments. Either this method should accept `BsonValue` or it should handle any suitable objects, as it did before.