You can drop this comment. `lseek` (the POSIX function) returns an `off_t`, which can be larger than a `long` (which an RPython `int` is) on some platforms. Eventually we'll want to select a `Bignum` or `Fixnum` appropriately. For now you can leave a comment like,
```
# TODO: this currently truncates large values, switch this to use a Bignum in those cases
```

Or you can just do that if you feel like it ;)