feat: force_numerical_value_in(U) added

src/core/include/mp-units/quantity.h

@@ -183,6 +183,13 @@ public:
     return (*this).in(U{}).numerical_value_ref_in(U{});
   }
 
+  template<Unit U>
+    requires requires(quantity q) { value_cast<U{}>(q); }
+  [[nodiscard]] constexpr rep force_numerical_value_in(U) const noexcept
+  {
+    return value_cast<U{}>(*this).numerical_value_in(U{});
+  }
+
   template<Unit U>
     requires detail::QuantityConvertibleTo<quantity, quantity<quantity_spec[U{}], Rep>>
   [[nodiscard]] constexpr quantity<quantity_spec[U{}], Rep> in(U) const