ob-async does not specify correct minimum required Emacs version - seq-random-elt missing

[ZelphirKaltstahl]

Checklist

• [X] I followed the troubleshooting guide and it did not address my issue
• [X] I've included a link to a Github Gist with the full contents of my troubleshooting.org buffer
• [X] (hopefully) Each section below is filled in and includes sufficient detail to reproduce the issue

Expected Behavior

• The code should run, give a sensible result, and run asynchronously.
• Versions should be specified correctly for the ob-async package.

Actual Behavior

• The code is not run without error and the result is weird.
• Versions are specified as follows in the melpa-stable package summary inside Emacs: Requires: async-1.9, org-9.0.1, emacs-24.4, dash-2.14.1, however, emacs-24.4 does not seem to have seq-random-elt.

Steps to Reproduce

1. Install Emacs in version: GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21) of 2017-09-22, modified by Debian
2. Install ob-async via list-packages and from melpa-stable
3. Create an Org-mode file.

4. Add the following source block:

   #+BEGIN_SRC elisp :async :results output
   (async-start
   ;; What to do in the child process
   (lambda ()
    (message "This is a test")
    (sleep-for 3)
    222)
   
   ;; What to do when it finishes
   (lambda (result)
    (message "Async process done, result should be 222: %s" result)))
   #+END_SRC

5. Try to run the code.
6. See the error message in the *messages* buffer.

Troubleshooting Artifacts

I created an emacs.stackexchange question about this problem: https://emacs.stackexchange.com/questions/48658/ob-async-issue-seq-random-elt-not-defined

Here is my troubleshooting.org file: https://gist.githubusercontent.com/ZelphirKaltstahl/68ab4f8cbd558fb6eea71e211adb1269/raw/cdd614e8069f7bd3a6da64c1d594e07414b49f6f/troubleshooting.org

[astahlman]

Will try and find some time to look at this in-depth in a few days, but I don't immediately understand the issue.

ob-async does not directly call seq-random-elt, and I don't see any reference to it in https://github.com/jwiegley/emacs-async either.

The integration tests run against Emacs 24.5, too, so if the package were totally broken on Emacs 24 the tests should surface it (in theory).

[ZelphirKaltstahl]

Could it be a dependency of a dependency issue?