RFC 4007 IPv6 scopes don't work:

$ gpg --keyserver '[2a00:1828:a00d:ffff::4%eth0]' --refresh 0xEE05E6F6A48F6136
gpg: could not parse keyserver URL

Came up when writing testcases for connecting to keyservers.

needs to be fixed in dirmngr/dns-stuff.c as well as the connection code, as the scope implies with interface to use to make the connection from.