operator ~/ method
Truncating division (toward zero), like Rust's / or C's /.
Int32.min ~/ Int32.minusOne wraps back to Int32.min (the one
case where the mathematical quotient doesn't fit).
Implementation
Int32 operator ~/(Int32 other) {
if (other.isZero) throw IntegerError.overflow;
if (this == Int32.min && other == Int32.minusOne) return Int32.min;
return Int32(toInt() ~/ other.toInt()); // magnitudes <= 2^31, safe
}