Hi,

> Be warned that we're in a feature-freeze phase. It will have to wait for
> Org 9.1 before being merged.

Sounds good to me!

>
>> +	    ;; Go to parent, even if no children exist
>
> Nitpick: Missing final dot.
>
>> +	    (org-up-heading-safe)
>> +	    ;; Update cookie of parent
>
> Ditto.
>> +	    (org-update-statistics-cookies nil)))
>>  	(message "Subtree archived %s"
>>  		 (if (eq this-buffer buffer)
>>  		     (concat "under heading: " heading)
>> @@ -470,6 +476,9 @@ Archiving time is retained in the ARCHIVE_TIME node property."
>>  	(outline-hide-subtree)
>>  	(org-cycle-show-empty-lines 'folded)
>>  	(goto-char pos)))
>> +    (when org-provide-todo-statistics
>> +      ;; update todo statistics of parent
>
> Ditto. Missing capital, too.
>
>> +      (org-update-parent-todo-statistics))
>>      (org-reveal)
>>      (if (looking-at "^[ \t]*$")
>>  	(outline-next-visible-heading 1))))

Fixed.

> Could you provide some tests and an ORG-NEWS entry? For the latter, you
> can start a new "Version 9.2" top heading.

Done.

I'm not sure if I did the tests 'correctly' though. I placed them in
test-org-element.el since there was a little bit of archive based
testing there, is there a better place to put them? I couldn't find any
file for org-archive testing. Maybe I'll write some more archive tests
later...

+    (should (string=
+	      (org-element-property :title (org-element-at-point))
+	      "Top [0%]")))
Is there a better way to extract the status cookie percentage from the
header? I couldn't find anything in (org-element-property)'s output.

Thanks,
-Jay