Provide changeClassTo: as a convenient way of accessing adoptInstance:, and a better replacement for the older primitiveChangeClassTo:.
=============== Diff against Kernel-ul.1192 ===============
Item was added:
+ ----- Method: Object>>changeClassTo: (in category 'converting') -----
+ changeClassTo: aBehavior
+ "Change the class of the receiver to the argument, provided
+ that the format of the argument matches the format of the receiver's class."
+ aBehavior adoptInstance: self.