Methods for reinitialize-instance may be defined to specify
actions to be taken when an instance is updated. If only
after methods for reinitialize-instance are defined,
they will be run after the system-supplied primary method for
initialization and therefore will not interfere with the default behavior of
reinitialize-instance.
Methods for shared-initialize may be defined to customize
class redefinition. For more information, see Section 7.1.5 (Shared-Initialize).