guix upgrade: packages to upgrade, but nothing to be done

[Josh Holland]

Hi Guix,

This is not a super-major issue, but I'm a little confused as to what's
going on.  If I run `guix upgrade` (on a freshly-pulled guix), I get the
following output:

$ guix upgrade
The following packages will be upgraded:
   transmission:gui     2.94 → 2.94     
/gnu/store/4q11i2maw5rim3sv5fglpn1pc8nmk6bd-transmission-2.94-gui
   zathura      0.4.3 → 0.4.3   
/gnu/store/pvl4hys5i37a6b321rnml21wkm9xx296-zathura-0.4.3
   streamlink   0.14.2 → 0.14.2 
/gnu/store/04kjbcsypn12wvjplvais7ync7c2d1d2-streamlink-0.14.2
   guile        2.2.6 → 2.2.6   
/gnu/store/zp53jz14ql8syglh4nyrwmq2awvfirb8-guile-2.2.6
   glibc-locales        2.28 → 2.28     
/gnu/store/bb9alx1ap57pz0vmx7p1r8qk0lxxfg3x-glibc-locales-2.28
   git:send-email       2.22.0 → 2.22.0 
/gnu/store/0h88j29z674whbwvq0klwwv6p7nqapxx-git-2.22.0-send-email
   git:credential-netrc 2.22.0 → 2.22.0 
/gnu/store/4x9x7blnfd20r1kypr93472f3mlsh6xh-git-2.22.0-credential-netrc
   emacs-use-package    2.4 → 2.4       
/gnu/store/2lsz1bb9w06y35jsz6q940jhqjva9i5x-emacs-use-package-2.4
   emacs-request        0.3.0 → 0.3.0   
/gnu/store/1wgmfcigry8k2yxzg3mcwjl6ix7rqlwv-emacs-request-0.3.0
   emacs-org-caldav     20180403 → 20180403     
/gnu/store/77yvd57qbjyxl32nqd8l2bs9w5zphcd9-emacs-org-caldav-20180403
   emacs-magit  2.90.1-1.b4aec01 → 2.90.1-1.b4aec01     
/gnu/store/8zh9k3ykp5d5a2ssp2mqwrnacdbdvhfg-emacs-magit-2.90.1-1.b4aec01
   emacs-haskell-mode   16.1 → 16.1     
/gnu/store/5jhjnq8198jqrdzrjh5qs8l5gq7gry64-emacs-haskell-mode-16.1
   emacs-guix   0.5.1.1 → 0.5.1.1       
/gnu/store/flids6v745dm800hqcs6q8icqykm7vjl-emacs-guix-0.5.1.1
   emacs-flycheck       31 → 31 
/gnu/store/65dsxk1rinn513cycg99awd1gq6sy6vc-emacs-flycheck-31
   emacs-company-auctex 0-1.48c42c5 → 0-1.48c42c5       
/gnu/store/p36y0kbza7g36kijy99dkwxgvgx90ddh-emacs-company-auctex-0-1.48c42c5

nothing to be done

I've seen packages being "upgraded" to the same version that they
already are before, and I am led to understand that this is typically
due to some input being upgraded.  But why are no changes actually being
performed in the end?

Thanks,
Josh

--
Josh Holland