It seems like Lua addition is not working when dealing with large numbers (64bit values). I have tried to compute the following:

```
71776119061217280 + 281474976710655
```

or in hexa

```
0x00FFFFFFFFFFFF
+ 0xFF000000000000
```

**Lua 5.1**, **5.2**, and **5.3** all return

```
72057594037927936 (= 0x100000000000000)
```

No need to take out your calculator to see that this is wrong. An even number added to an odd number is not an even number. As a matter of fact, it seems to be off by 1 (the right result is **72057594037927935**). In hexa the problem is even more obvious since the result should be **0xFFFFFFFFFFFFFF**.
Anyone knows what's happening, or what I would be doing wrong here?

## Update:

For info, I am seeing this with ZeroBrane Studio on Windows 10.