[Pharo-project] Pharo analog to Dolphin's "immediate objects"?

Hello all, Dolphin stores small integers and characters entirely in the header, and describes them as having "immediate" storage. Is there a similar concept in Pharo? I _think_ I can get around it by looking at other tests such as #isBytes, but I am still trying to decide whether they are simply named the same way or actually do the same thing. Bill