throw new JsonParseException("Unknown concrete type for " + baseClass + ". Expected: " + implClass + ", actual: " + value.getClass());
            }
            JsonObject jsonObject = implClassAdapter.toJsonTree((U) value).getAsJsonObject();
            JsonObject clone = new JsonObject();
            clone.add(label, new JsonPrimitive(label));
            for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {