Even-though proving anything about Floats is very hard, we should print them. (from Lean's zulip : [#Program verification > We can’t prove anything about Float right?](https://leanprover.zulipchat.com/#narrow/channel/236449-Program-verification/topic/We.20can.E2.80.99t.20prove.20anything.20about.20Float.20right.3F/with/541702395))