returns the earliest unfinished preceding DOS or finished, but without absolute positioning information.
returns the earliest unfinished preceding DOS or finished, but without absolute positioning information.
This returns Nope when the length is unable to be computed currently.
This returns Nope when the length is unable to be computed currently.
(Note that this differs from the way the length-related Evs work where returning Nope means variable-width encoding and lengthUnits characters were being used, and inability to compute is indicated by thrown exceptions.)