while-stopped names resource ids of the same module's containers; the host
stops them before the run and starts them again after it, in reverse order,
whatever the step did. The restart is deferred before the first stop and runs
on its own context, because the one real risk of this field is a window that
never closes.
Scheduled steps only: at apply the declaration is applied in order and a
run-once step already gates what follows.
jschoubben
f3e135dfc9