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Previously, you could override the class initialize_dup/initialize_clone method and the class hierarchy would not be set correctly inside the method before calling super. This removes Module#initialize_copy, and instead makes Object#dup/clone call the underlying C function (rb_mod_init_copy) before calling the appropriate initialize_dup/initialize_clone method. This results in the following fixes: * The appropriate initialize_dup method is called (dup on a class will respect superclass initialize_dup). * Inside class initialize_dup/initialize_clone/initialize_copy, class ancestor hierarchy is correct. * Calling singleton_class inside initialize_dup no longer raises a TypeError later in dup. * Calling singleton_class.ancestors inside initialize_dup no longer results in missing ancestors. Fixes [Bug #21538]