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Channel/broadcast contact keys carry a leading channel-digit prefix (e.g. "0^all"); DM keys don't. A retired channel still ends ^all, so it stays with the channels it used to be one of.
Channel/broadcast contact keys carry a leading channel-digit prefix (e.g. "0^all"); DM keys don't. A retired channel still ends ^all, so it stays with the channels it used to be one of.