The physical inputs left holding +48 V with NO channel sourcing them (#384).
A singleton because the fact is precisely about inputs no strip owns: a re-patched channel
leaves the voltage on the socket it vacated, and there is no longer a strip to hang the
warning on. That is the cardinality argument in the one direction it points the other way —
a per-channel field could not hold it, because the channel is gone.
The physical inputs left holding +48 V with NO channel sourcing them (#384).
A singleton because the fact is precisely about inputs no strip owns: a re-patched channel leaves the voltage on the socket it vacated, and there is no longer a strip to hang the warning on. That is the cardinality argument in the one direction it points the other way — a per-channel field could not hold it, because the channel is gone.