Example usage:

```

[test]

fn itworksforf641() { assertne!(abs(3.1f64, 2.5f64), 0.6f64); asserteq!(abs(3.1f64, 2.5f64), 0.6000000000000001f64); }

[test]

fn itworksfori32() { asserteq!(abs(42i32, 69i32), 27i32); }

[test]

fn itworksforu8() { asserteq!(abs(42u8, 69u8), 27u8); } ```