1.5 + 1 = 2.5 ----> was that number round down anyhow ? If you round it .. it should be UP .. not DOWN or was it that in the code the .5 was dropped ?
There's no mathematical rule that says how numbers should be rounded off. Rounding numbers is a social convention for expressing approximate numbers.
As far as I can tell under D&D 5E rules, you ALWAYS round down any time you get a fraction. Even if the fraction is 0.9, you round it down.
