Fomus

these are marks that are specified in timesig objects (and are called properties rather than marks). they either affect one location in the score at the timesig object's offset or the entire region of the score governed by that time signature.

at the moment there's only one property, :barline that changes the type of barline that appears at the timesig's offset.

(:barline :single || :double || :final || :repeatleft ||
          :repeatright || :repeatleftright || :invisible)