It depends on how you use the under floor heating. Some people use them like regular heating, where you turn it off and only turn it on when you want it to get warmer. In this use case the floor is warmer than the room and you will feel the floor getting warm. This is however not the most efficient way to use underfloor heating for rooms that are in use most of the time.
For rooms where people are most of the time, the most efficient use of underfloor heating is to have the water at the desired temperature all the time. That way it’s very easy to heat up the water, since if only needs to be a bit over ambient and only the heat lost in the system needs to be replaced. In this case the floor and the room become the exact same temperature and won’t feel warm. It just won’t feel cold, like the floor would without the heating.
In my experience in the legacy world we have the isHighDate function which not only checks the constant, but also 5 other edge cases where the value isn’t HIGH_DATE but should be treated as if it is.