[opnitro]

Nit picking, but floating point is commutative either.

  1 + NaN == NaN
  Nan + 1 == NaN
  Nan != Nan

(NaN is defined as not being equal to itself)

[danbruc]

Nit picking, but floating point is not commutative either.

[opnitro]

ya got me

[H8crilA]

Well then define it to be equal to itself ;)

NaN is a strange thing anyways, for example you cannot invert it so that NaN+(-NaN)=0