Common Lisp the Language, 2nd Edition

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### 28.1.12.1. Customizing Reinitialization

Methods for the generic function `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 (see section 28.1.9.5).