The destination-hold refusal's evidence, stated exactly: 124 episodes both
sides, same episode list, every byte count identical, 31.5 GiB each way,
head+tail blake2b identical on a 6-episode sample.
Plus the law this came out of: a path-substring filter for a series name also
returns other shows (monk matches Monkey Dust), and whichever file a walk
reaches first standing in for an episode turns two libraries into a fake
duplicate — the same sloppiness aimed the other way deletes a unique file.
ep_of on both sides, and a hash before anything is trashed.