[Pharo-dev] what is the relationship between Float and its subclasses?

[stepharo]

Hi

I'm updating Pharo by example and the relationship between Float and its 
subclasses is unclear to me.
Do we only get instances of the subclasses now?
I got that Boxed is only for 64 bits.
But SmallFloat?
The class comment is not really self describing.

Stef