Be able to work with NaN

[GerardvSchie]

dependent: #102
We would want to remove the Either in order to use the Maybe monad for the operators

NaN is weird but does work
{} >= 0
true

{} > 0
false

{} >= -5
true

{} == 0
false

{} === 0
false.

Need to adapt the functions

[JTeeuwissen]

@GerardvSchie

We would want to remove the Either in order to use the Maybe monad for the operators

what do you mean by this?
I'm confused as to what this issue is about.