The valid result from BigInt % uint ranges from -4_294_967_294 to 4_294_967_294, so it must return a long and not an int.
import std.bigint;
void main()
{
// current 2.078.0 result - WRONG
assert(BigInt( 4_294_967_294) % 4_294_967_295U == -2);
assert(BigInt(-4_294_967_294) % 4_294_967_295U == 2);
// expected result - currently fails
assert(BigInt( 4_294_967_294) % 4_294_967_295U == 4_294_967_294);
assert(BigInt(-4_294_967_294) % 4_294_967_295U == -4_294_967_294);
}