I was messing around with SmallDictionary when I suddenly realised that
I can't find a single reason to use it over a normal Dictionary. While its name and class comment imply that it is somehow an optimised Dictionary, I don't see any measurement where that actually holds up. The following was run in a Pharo 7 image on a recent VM (see below):
FWIW it seems there is no SmallDictionary in Squeak.
Stef