Counting without numbers

I was writing something along these lines:

(loop [state init, n (count some-seq)]
  (if (pos? n)
    (recur value (dec n))
    (ends here)))

when it struck me that seqs are numerals too!

(loop [state init, n some-seq]
  (if (seq n)
    (recur value (rest n))
    (ends here)))

or:

(loop [state init, n (seq some-seq)]
  (if n
    (recur value (next n))
    (ends here)))