@ref{Development}.
One known regression against 2.12.3 still exist:
-@uref{http://code.google.com/p/lilypond/issues/detail?id=1263,
+@uref{http://code.google.com/p/lilypond/issues/detail?id=1173,
Issue 1173 MetronomeMarks cannot be aligned on a note if a
multi-measure rest exists in another voice}, but we expect to find
more. If you decide to test 2.13.34, do not be surprised to