RollingModifier

Characters roll on a cyclic glyph wheel: every covered character found in Wheel renders as its wheel position minus the effective roll, with the fractional part shown as two stacked wheel glyphs sliding through the character's cell (one em of travel per step, clipped to the wheel's ink band). The default digit wheel is an odometer; a letter wheel with a trailing space is a split-flap board. Characters outside the wheel pass through untouched. Drive Roll toward 0 to settle on the real text; at 0 the modifier costs nothing.