I get the point, but doesn't changing floating-point to arbitrary precision so that 10.21 - 10.2 = 0.01 and not 0.0100000000000016 count as a user-visible change? Or should they have put a "now with bugs fixed" sticker on it?
I think part of this is that the user would not try 10.21- 10.2 again if they have already seen it fail, but a graphical update alongside denotes that this thing is "new" again.