feat: dimensionless quantities with a unit one are not special anymore

example/kalman_filter/kalman.h

@@ -124,7 +124,7 @@ constexpr state<Q1, Q2, Q3> state_update(const state<Q1, Q2, Q3>& predicted, QM
 template<mp_units::Quantity Q, mp_units::QuantityOf<mp_units::dimensionless> K>
 constexpr Q covariance_update(Q uncertainty, K gain)
 {
-  return (1 - gain) * uncertainty;
+  return (1 * mp_units::one - gain) * uncertainty;
 }
 
 // state extrapolation

example/storage_tank.cpp

@@ -121,7 +121,7 @@ int main()
 
   const QuantityOf<isq::mass_change_rate> auto input_flow_rate = measured_mass / fill_time;
   const QuantityOf<isq::speed> auto float_rise_rate = fill_level / fill_time;
-  const QuantityOf<isq::time> auto fill_time_left = (height / fill_level - 1) * fill_time;
+  const QuantityOf<isq::time> auto fill_time_left = (height / fill_level - 1 * one) * fill_time;
 
   const auto fill_ratio = fill_level / height;