Suggestion: more helpful wrong-type errors

[bherw]

Currently the exception just states that the value was the wrong type, for example:

org.json.JSONException: JSONObject["layers"] is not a JSONArray.

It would be helpful if the exception told us what the type actually was as well. Was it null? JSONObject? something else?

[stleary]

@bherw thanks for raising this issue. No objections if you want to try some type of implementation. More helpful errors are always welcome.