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Nov 25, 2022 at 08:40
Common Lisp has a function change-class that lets you change the class of instance (like reassigning __class__ in Python). http://clhs.lisp.se/Body/f_chg_cl.htm I love the note at the end: "semantic difficulties" if you call any methods whilst the class changes!
CLHS: Standard Generic Function CHANGE-CLASS

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