I am serious (and recommend reading the paper I quoted to have a good understanding of the trade-of offered by posits). Overall, posits are a new trade-of that

I am serious (and recommend reading the paper I quoted to have a good understanding of the trade-of offered by posits). Overall, posits are a new trade-of that will give you better precision (nothing exact, it is still an approximation) when you manage to keep all your number in a small range. Once you get out of that range precision drops significantly (whereas the precision of classical floating points drops gradually). Posit8 are equivalent to 8 bits floating points (minifloats) making them an easy target for pathological cases but the example still illustrate the fact that, contrary to floating-point arithmetic, multiplication by a multiple of two is not exact with posits (one of several good properties we take for granted and would lose when switching to posits).