should "git tag" option of "-a" conflict with "-s", "-u"?

From: Robert P. J. Day <rpjday@crashcourse.ca>
Date: Sep 14, 2017, 10:08 UTC
Message-ID: <alpine.LFD.2.21.1709130741120.2766@localhost.localdomain>

  just noticed in "man git-tag":

  1)  "-a" explicitly claims to create an unsigned tag
  2)  both "-s" and "-u" both claim to create signed tags

should that mean that it should be an error to try to use "-a" in combination with either of "-u" or "-s"? the synopsis does suggest that you can use only one of those at a time:

  git tag [-a | -s | -u <keyid>] ...

but i tested with (from memory) using both "-a" and "-s", and tag actually tried to do it, but failed simply because i had no key. clearly, though, it was making the attempt.

  can someone clarify this?

rday

-- 
========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================