> It could be fixed. The question is, should it ?
>
> I thought about this and made the decision not to do it.

You have your reasons, but in my case it just makes one of my most 
common object impossible to serialize: one of its instance variable is a 
Fraction.

> But you could overwrite #stonOn: and #fromSton: specifically for Fractions, maybe like this:
[...]

Thanks for the pointer !


Best,

Stef