Silent error with overflowed integer

[skull591]

Hello,

Thanks for this great library. While using it, I encounterd an error with overflowed integer. I was able to reproduce this on json-data.cpp with a large integer.

* limitations under the License.
*/

#include <iostream>
#include "xpack/json.h"
#include <string>

using namespace std;

struct Example {
    string type;
    xpack::JsonData data;
    XPACK(O(type, data));
};

struct Range {
    int min;
    int max;
    XPACK(O(min, max));
};

struct User {
    int id;
    string name;
    XPACK(O(id, name));
};

static void test(const std::string &data) {
    Example e;
    xpack::json::decode(data, e);
    if (e.type == "range") {
        Range r;
        e.data.Get(r);
    } else if (e.type == "user") {
	User u;
	e.data.Get(u);
	cout << u.id << endl;
    } else {

    }

}

int main(int argc, char *argv[]) {
    (void)argc;
    (void)argv;

    string s1 = "{\"type\":\"range\", \"data\":{\"min\":12, \"max\":33}}";
    string s2 = "{\"type\":\"user\", \"data\":{\"id\":123344343434343435, \"name\":\"xpack\"}}";
    test(s1);
    test(s2);
    
    return 0;
}

With a large number in the id of s2, no error was reported (I tried with a larger number and an error indicting not integer is given, which I think should be the correct behavior), but the output is -545967093.

I'm using the latest version of the library on Ubuntu 20.04LTS.

[xyz347]

Thanks for your feedback.
All integers are currently parsed as int64 and then static cast to the target type.
Let me think about how to deal with this better.