According to @deanmlittle, decentralized exchanges use u128 arithmetic in invariant curve calculations to prevent u64 overflow, a critical implementation detail in DEX pricing logic. Source: @deanmlittle on X, Aug 25, 2025. He adds that ignoring this can be exposed by a flame graph during performance profiling, underscoring why 128-bit math matters in DEX engines. Source: @deanmlittle on X, Aug 25, 2025.