Comment #6 on issue 2376 by d...@gnu.org: Automatic footnotes on \null markups causes unexpected results
http://code.google.com/p/lilypond/issues/detail?id=2376
A whole note stencil has properties. A non-empty list has elements, a non-empty string has characters. Those can be changed and overwritten. For that reason, you need to create copies before you modify something like '(a) or "a", or things may go wrong. But you don't need to create copies before working with '() or "" since there is nothing that could be modified here. They are self-contained. It would be nice if we had an elemental entity satisfying ly:stencil? that had the same property of being a basic extensible building block without repercussions on the original.
There will be lots of situations where one will want to pass a typed equivalent of "nothing", and it is a nuisance if "nothing" needs to get allocated anew every time and is not eq? to "nothing".
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