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1.203.1 VersionableObjectProxy class: saving and restoring

to
loadFrom: anObjectDumper
Retrieve the object. If the version number doesn't match the #binaryRepresentationVersion answered by the class, call the class' #convertFromVersion:withFixedVariables:instanceVariables:for: method. The stored version number will be the first parameter to that method (or nil if the stored object did not employ a VersionableObjectProxy), the remaining parameters will be respectively the fixed instance variables, the indexed instance variables (or nil if the class is fixed), and the ObjectDumper itself. If no VersionableObjectProxy, the class is sent #nonVersionedInstSize to retrieve the number of fixed instance variables stored for the non-versioned object.