Severity: minor
Tags: patch

As mentioned in a past commit[1], nil is not an event.
Since the car of a mouse click event is considered its type,
shouldn't (nil) also be rejected as an event?

  (eventp '(nil)) ; => t

Should t be counted as an event?

  (eventp t)    ; => t
  (eventp '(t)) ; => t

If not, would the following change be welcome?