operator - method
Implementation
Uint128 operator -(Uint128 other) {
final (loDiff, borrowMask) = Uint64.sbb(_lo, other._lo, Uint64.zero);
final borrowBit = borrowMask.isZero ? Uint64.zero : Uint64.one;
final hiDiff = _hi - other._hi - borrowBit;
return Uint128._(hiDiff, loDiff);
}