not all numbers are treated the same way

[Pantelis Kavallieratos <kavallieratos@...>]

one would expect that b=1-(1-a) leads to b=a

that is not always the case if a is a rational number less than 1

if a is one of the following 1/3, 1/5, 1/6, 2/6, 1/7, 3/7, 1/9, 3/9, 1/10, 2/10, 3/10, 1/11 ...

b=1-(1-a)

print(a==b)

returns false!