Comment #10 on issue 3179 by [email protected]: too much dots in chords
http://code.google.com/p/lilypond/issues/detail?id=3179
Normally, lilypond returns value 0.0 if a numeric property isn't set
No, it doesn't. LilyPond returns SCM_EOL (the Scheme empty list
constant, '()) for unset properties, regardless of the property's type.
Only if you use robustscm2number on that or whatever it is called do you
get whatever you specify as second argument.
The usual way, for that reason, is to use scm_is_number on the result of
the property getting call and consider the property unset if it is not a
number.
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