"Basil L. Contovounesios" <contovob@tcd.ie> writes:

> One solution is to leave seq-contains as it is, and switch to using
> seq-position (or some new predicate) as a predicate instead.  Another is
> to make seq-contains return a boolean instead of the needle found, which
> would be a backward-incompatible change similar to that for
> map-contains-key.  I attach a patch for each of these respective
> solutions; WDYT?

We also have `seq-some' which can be used as a contain predicate,
e.g. to fix this bug: