[json-lib-user] Proposal to add the isNullObject method into JSON interface

[Philippe A. <fut...@gm...>]

Hello!

I would like to propose adding the isNullObject method into the JSON
interface.

The current way to determine if an object is null is by comparing the result
of toString with the "null" string. This is the only method common to
NULLObject and JSONObject allowing to do that. It works but it is not as
efficient as isNullObject since time must be spent building a string
representation of the object if it is not null.

Besides adding the declaration in the JSON interface, it would be only a
matter of implementing a function returning true in JSONNull. Obviously it
would break compatibility for those who implemented the JSON interface for
other purposes.

Let me know what you think.