auto a = UInt!128.fromHexString("dfbbfae3cd0aff2714a1de7022b0029d"); assert(a.signBit); a.signBit = false; assert(a == UInt!128.fromHexString("5fbbfae3cd0aff2714a1de7022b0029d")); assert(!a.signBit); a.signBit = true; assert(a == UInt!128.fromHexString("dfbbfae3cd0aff2714a1de7022b0029d"));