Decimal Harvest Level

So, here's what I got. Decimal Harvest Levels so I can have a ore mineable by stone, but that ore can't mine iron, because it's harvest level is 1.4;

So, since the ore's pickaxe's harvest level is below two, it can't mine iron;

(P.S. I'm sorry if this is a repeat request, I had to do this quickly, so I couldn't look at the Changelog for the older versions.)