pub fn commit_nba(
log: &mut NbaLog,
arena: &mut dyn SignalAccess,
at: SchedTime,
sink: &mut dyn ValueChangeSink,
) -> usizeExpand description
The SC-039 NBA commit pass: take()s log, applies each cell’s updates
in staging order, writes each through arena, and calls
sink.notify_change(..) for every update that actually changed the stored
value (SC-040/SC-041). Returns the count of cells that changed.