gpg2.1's --quick-sign-key -- exact matching

gpg2.1 has a nice feature unattendded key-signing. However, its matching seems to be somewhat fuzzy. E.g, if I have two uids like 'Foo' and 'Foo Bar' on a key with fingerprint FPR, gpg --quick-sign key FPR Foo will sign both. Can I force it to do exact matching?