gpg-sq doesn't implement User ID matching the same as gpg-g10code

gpg(1) says you can ask for an exact match on a User ID by prefixing your search with an = sign:

HOW TO SPECIFY A USER ID
[…]
      By exact match on OpenPGP user ID.
              This is denoted by a leading equal sign. It does not make sense for X.509 certificates.

         =Heinrich Heine <heinrichh@uni-duesseldorf.de>

This does not appear to work with gpg-sq:

0 dkg@alice:~$ gpg-sq --list-keys 'Justus Winter <justus@sequoia-pgp.org>'
pub   rsa4064 2017-07-19 [C] [expires: 2024-07-18]
      CBCD8F030588653EEDD7E2659B7DD433F254904A
uid           [  full  ] Justus Winter <justus@sequoia-pgp.org>
uid           [  full  ] <teythoon@uber.space>
uid           [  full  ] Justus Winter
uid           [ unknown] Justus Winter <justus@gnupg.org>
uid           [ unknown] Justus Winter <justus@pep.foundation>
uid           [ unknown] Justus Winter <justuswinter@gmx.de>
sub   rsa2048 2017-07-19 [A] [expires: 2024-07-18]
sub   rsa2048 2017-07-19 [S] [expires: 2024-07-18]
sub   rsa2048 2017-07-19 [E] [expires: 2024-07-18]

0 dkg@alice:~$ gpg-sq --list-keys '=Justus Winter <justus@sequoia-pgp.org>'
gpg: error reading key: No public key
2 dkg@alice:~$ 

This was first reported in https://bugs.debian.org/1070688