Comment #37 on issue 4022 by [email protected]: Patch: Allow specifying different
alignment for grob and its parent
http://code.google.com/p/lilypond/issues/detail?id=4022
Regarding #35: #f basically means "explicitly off", while '() does not have
as explicit a meaning. Calls to ly:grob-property and ly:context-property
cannot distinguish a property that has never been set (and has no default)
from a property that is explicitly set to #'() in some context: that
difference is basically only visible to the C++ layer. However, setting a
property to #'() _does_ override settings in outer contexts.
As such, #'() to mean "take default from somewhere else" is sort-of a
natural choice.
LilyPond uses '() in a number of situations where Scheme would likely
consider #f more suitable. In Lisp, both are the same and called NIL.
Maybe LilyPond's use of #'() is a bit influenced by the original LilyPond
authors knowing Lisp.
At any rate, that choice fits usage of #'() elsewhere reasonably well.
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