Long upper limit value

Use Gson
```
Gson gson = new Gson();
Long a = gson.fromJson("9223372036854775808", Long.class);
System.out.println(a);

=> 9223372036854775807
```

Use JsonPrimitive
```
var jp = new JsonPrimitive("9223372036854775808");
Long b = jp.getAsLong();
System.out.println(b);

=> java.lang.NumberFormatException: For input string: "9223372036854775808"
```

Use Long.valueOf
```
Long c = Long.valueOf("9223372036854775808");
System.out.println(c);

=> java.lang.NumberFormatException: For input string: "9223372036854775808"
```

Why is there no error in Gson?
Is this a bug? Or is it a specification?
I want an error to occur.