project parameter for task creation should accept hashtags and project IDs (numbers) not just canonical names

Why?

(And as upstream wrote, ID is unlikely to get supported.)

Why?

so links don't break? why does MediaWiki have a feature to automatically create a redirect on page move?

https://www.mediawiki.org/wiki/Topic:Shqmd7ub5wa3i5mh

I don't understand. The whole point of this ticket is that the only way the parameter currently works is with the primary hashtag. Passing an additional hashtag foes not populate the form. Therefore link with hashtag prepopulated breaks on rename. Even if the rename was done correctly.

In T99943#1323962, @jeremyb wrote:

I don't understand. The whole point of this ticket is that the only way the parameter currently works is with the primary hashtag. Passing an additional hashtag foes not populate the form.

Hmm? https://phabricator.wikimedia.org/maniphest/task/create/?projects=bot-requests fills in "Phabricator-Bot-Requests" in the "Projects" field so it seems to pick up the secondary hashtag?

you're welcome to compare to the situation that prompted filing this. (link in T99943#1323040)

So after spending time reading all that stuff:
The testcase is/was
https://phabricator.wikimedia.org/maniphest/task/create/?projects=Repository-Ownership-Approvers which does not work due to being called Repository-Ownership-Requests now. I'll add that to the task description as specific testcases are generally welcome when creating tasks.