An example from description of seq-uniq has a typo:
(seq-uniq '(1 2 2 1 3))
          ⇒ (1 2 3)
          (seq-uniq '(1 2 2.0 1.0) #'=)
          ⇒ [3 4] ;; *typo - should be [1 2]*

Regards,
Ihor