Gson. Deserialize integers as integers and not as doubles

Question

I have json object with arbitary values inside. And I want to deserialize it in a Map. Everything is ok except converting integers to a doubles. See example:

Answer 1

Been searching for a solution to the nested Map problem myself and "이종은" above was the first answer that actually helped in the non trivial use cases.

Since the solution above only handled Number I updated the solution to provide generic parsing capability for String and booleans also, see the updated code below:

private static class MapDeserializer implements JsonDeserializer> {

    public Map deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        Map m = new LinkedHashMap();
        JsonObject jo = json.getAsJsonObject();
        for (Entry mx : jo.entrySet()) {
            String key = mx.getKey();
            JsonElement v = mx.getValue();
            if (v.isJsonArray()) {
                m.put(key, g.fromJson(v, List.class));
            } else if (v.isJsonPrimitive()) {
                Number num = null;
                ParsePosition position=new ParsePosition(0);
                String vString=v.getAsString();
                try {
                  num = NumberFormat.getInstance(Locale.ROOT).parse(vString,position);
                } catch (Exception e) {
                }
                //Check if the position corresponds to the length of the string
                if(position.getErrorIndex() < 0 && vString.length() == position.getIndex()) {
                  if (num != null) {
                    m.put(key, num);
                    continue;
                  }
                }
                JsonPrimitive prim = v.getAsJsonPrimitive();
                if (prim.isBoolean()) {
                    m.put(key, prim.getAsBoolean());
                } else if (prim.isString()) {
                    m.put(key, prim.getAsString());
                } else {
                    m.put(key, null);
                }

            } else if (v.isJsonObject()) {
                m.put(key, g.fromJson(v, Map.class));
            }

        }
        return m;
    }
}

private static class ListDeserializer implements JsonDeserializer> {

    public List