Allow JsonReader to tell if it peeked a long or double

Problem: I need to tell apart long from doubles when generically using a JsonReader. Example:

{ "amount" : "93.21948702", "count": 12 }

Today I need to know in advance that one is a double and the other an int/long so I can call nextDouble() or nextLong(). I want the reader to provide me enough information so that I can know which one to call or just give me the right object.

Solution 1: Add JSonReader#getPeeked() and make PEEKED_LONG and PEEKED_NUMBER public.

This leave me to do:

        if (reader.getPeeked() == JSonReader.PEEKED_LONG) {
            return Long.valueOf(reader.nextLong());
        }
        return Double.valueOf(reader.nextDouble());

Solution 2: Add JsonReader#getNumber() returns java.lang.Number. Which leaves me to do: reader.nextNumber() and I can deal with a Double or Long down the line.

I can propose a PR but I’d like to know if there are alternatives. Right now I am using, arg, reflection to get to JSonReader.peeked, PEEKED_LONG and PEEKED_NUMBER.

[lyubomyr-shaydariv]

If I’m not mistaken and remember how Gson readers work, you can check whether the peeked token type indicates a number, and then read it as a string. This would allow any parsing strategy since JSON is not restricted only with longs and doubles.

[eamonnmcmanus]

Fixed by #1290.