Return -1 on negative n:
abjad> from abjad.tools import mathtools
abjad> mathtools.sign(-96.2) -1
Return 0 when n is 0:
abjad> mathtools.sign(0) 0
Return 1 on positive n:
abjad> mathtools.sign(Duration(9, 8)) 1
Return -1, 0 or 1.
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