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1.9.21 Behavior: testing the form of the instances

instSize
Answer how many fixed instance variables are reserved to each of the receiver's instances


isBits
Answer whether my instances' variables are immediate, non-OOP values.


isFixed
Answer whether the receiver's instances have no indexed instance variables


isIdentity
Answer whether x = y implies x == y for instances of the receiver


isImmediate
Answer whether, if x is an instance of the receiver, x copy == x


isPointers
Answer whether the instance variables of the receiver's instances are objects


isVariable
Answer whether the receiver's instances have indexed instance variables