Comment #13 on issue 2149 by [email protected]: Patch: Creates
non-negative-integer? predicate.
http://code.google.com/p/lilypond/issues/detail?id=2149
I don't like counter? since it carries the connotation of a counter type
_variable_, but we are trying to flag a counter type _expression_ instead.
That's the reason I suggested count? here.
(count? (+ 2 3)) seems more or less sensible, (counter? (+ 2 3)) weird.
The properties for which we need the predicate _are_ counters, but the
predicate is not for the properties but rather for their values.
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