assume works incorrectly with very negative integer

[joonazan]

use symex_lib::{any, assume};

fn main() {
    let x: i128 = i128::MIN;
    assume(x < 0);
    assert_eq!(-x.abs(), x);
}

This code produces Encountered an unsatisfiable assumption, ignoring this path, even though the smallest value of i128 is definitely less than zero.

[joonazan]

i64 works fine, so I would assume the VM has some problem with 128 bit integers.