getLong and isType for JsonObject

I am wondering if it is possible to add a getLong() method in the JsonObject interface and is also is possible to add is type which check if the specified Object/Array/etc is given

Start by reviewing the JsonObject interface and the existing accessor and type-checking API around it. Clarify the intended getLong() behavior and which Object, Array, or other types need checks; the work is done when the API shape and expected behavior are specified and covered by appropriate tests.

Written by the indexing model from the issue text.