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The existing description was incorrect for socket addresses, and misleading: users would see “invalid IP address syntax” and suppose they were supposed to provide an IP address rather than a socket address. I contemplated making it two variants (IP, socket), but realised we can do still better for the IPv4 and IPv6 types, so here it is as six. I contemplated more precise error descriptions (e.g. “invalid IPv6 socket address syntax: expected a decimal scope ID after %”), but that’s a more invasive change, and probably not worthwhile anyway.