pub fn bps_mul(bps: u64, value: u64, divisor: u64) -> Option<u64> {
    bps_mul_raw(bps, value, divisor).unwrap().try_into().ok()
}

pub fn bps_mul_raw(bps: u64, value: u64, divisor: u64) -> Option<u128> {
    (value as u128)
        .checked_mul(bps as u128)?
        .checked_div(divisor as u128)
}
// These cases silently return None:
bps_mul(10_000, 1000, 0);  // Division by zero
bps_mul(20_000, 1000, 10_000);  // bps > divisor
