ADR 0201 gains the boundary found reading it back: a consumer keeping several
holders of a deriving provider is refused, because the two ends have no way
to agree. ADR 0189 gains two consequences — the sweep is bounded because it
runs inside a build, and an apply arriving mid-window reopens it.
That last one is issue 224, recorded rather than fixed: the host's rule for a
stopped container is to replace it, and while-stopped is the first thing that
makes a stopped container intentional. Both candidate fixes are decisions with
their own cost. Nothing is worse than it was; the store has never collected.
