numerical @value object name and expressions

[Mouvedia]

When an author uses @value to generate a number, its intention is most of the time to use it as a kind of custom unit like so:

@value rh { ref(height of @root) / 100 }

element
{
    //accepts numbers
    property: 15 * rh;
}

What I am proposing is letting the user do what he really wants:

element
{
    //would be equivalent
    property: 15rh;
}

In the same way that the universal selector can be ommited in certain cases, the multiplication operator could be as well if the number is prefixed to the custom unit generated using @value.