operator - method
Implementation
Uint256 operator -(Uint256 other) {
final (r0, m1) = Uint64.sbb(_d0, other._d0, Uint64.zero);
final (r1, m2) = Uint64.sbb(_d1, other._d1, m1);
final (r2, m3) = Uint64.sbb(_d2, other._d2, m2);
final (r3, _) = Uint64.sbb(
_d3,
other._d3,
m3,
); // top borrow discarded: wrapping
return Uint256._(r3, r2, r1, r0);
}