Comment #5 on issue 2149 by d...@gnu.org: Patch: Creates non-negative-integer? predicate.
http://code.google.com/p/lilypond/issues/detail?id=2149
That's what I meant with "Scheme has a definition". non-negative-integer? however is not really appropriate since negative integers don't even make sense in the context where you would want to use that predicate.
So something like unsigned? (somewhat ambiguous since the term does not really rule out a subset of fractions or floats) or unsigned-integer? (again awkward, but less so than non-negative-integer?) or just count? seem better suited.
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