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(plist-get '(foo 4) 'foo) ⇒ 4
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(setq my-plist '(bar t foo 4)) ⇒ (bar t foo 4) (setq my-plist (plist-put my-plist 'foo 69)) ⇒ (bar t foo 69) (setq my-plist (plist-put my-plist 'quux '(a))) ⇒ (bar t foo 69 quux (a))
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(defun put (symbol prop value) (setplist symbol (plist-put (symbol-plist symbol) prop value)))