The description of the current object set shows
what kind of objects are in the current object set. If there
is more than one class or array type in the current object set, a cumulative
count will be given separately for class instances and arrays. As
it is often the case, if all objects are of a single class or array type,
the class name or array type will be displayed.
how many selection steps have occurred so far. This gives
an idea of the complexity of the current selection.
how much space the current object set uses on the heap.
Note that this is the shallow size which does not include the sizes of
referenced arrays and class instances.