n_mapn out of range

using mapn with a named control, it might cause accidental overriding
of other controls:

a = { arg freq=#[200, 300, 400, 500], amp=0.1; Formant.ar(freq, 1020, 
100).sum * amp }.play;
b = {  Out.kr(72, LFNoise1.kr(1 ! 4) * 500 + 1700) }.play;

s.sendMsg("/n_mapn", a.nodeID, "freq", 72, 4); // fine
s.sendMsg("/n_mapn", a.nodeID, "freq", 72, 5); // not fine

maybe the server could catch that?
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