variables appear to be negated?

[sknebel]

Somehow it appears variables get negated between each step? Tested on the web version:

give it a go:
> z
unknown identifier 'z'
> z = 1
1
> z
-1
> z
1
> z
-1

(I picked z after noticing it with a to make sure the alias(?) of a to A didn't mess with things)

[printfn]

Oh wow, I didn't expect there to be this major a bug. I've fixed it now in 8486d9e, and the updated version is already live on https://printfn.github.io/fend. Only the web version was affected (not the CLI version).