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    Well a setf function can be a generic function. Expanders can be used for destructuring (e.g. values), and to avoid computing the same thing twice, e.g. if you incf something in a hashtable, you shouldn’t need to hash/lookup the key twice. Commented Feb 16, 2019 at 13:23
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    "When developing a package" -> setf forms are unrelated to packages. Commented Feb 16, 2019 at 15:51
  • @RainerJoswig Fair enough. :-) Commented Feb 16, 2019 at 16:39