For below code

    Document("a", 12).append("b", 14l).toJson()

The output is

{ "a" : 12, "b" : { "$numberLong" : "14" } }

If we change code as

    Document("a", 12).append("b", 14l).toJson(new JsonWriterSettings(JsonMode.SHELL))

It generates

{ "a" : 12, "b" : NumberLong(14) }

However in some circumstance, we expect to get the simple

{ "a" : 12, "b" : 14 }.

In the implementation of JsonWriter.doWriteInt64(), there is a default switch case for such output, but it never goes there because JsonMode has only two exact enum value.

So please add one new enum value for JsonMode, and then we can write code as

    Document("a", 12).append("b", 14l).toJson(new JsonWriterSettings(JsonMode.NEW_VALUE))

and then can get the simple output

{ "a" : 12, "b" : 14 }