Improve auto-inserted ordered list markup #3895

GitHub recently introduced a feature which auto-inserts list markup (e.g. - for unordered, - [ ] for checklists) when the Enter key is pressed from an existing list item within a comment field. The issue with this implementation is that it auto-increments the number on ordered lists, so if you enter this:

1. This is my first item.

And press Enter, you get this:

1. This is my first item.
2. 

The problem with this is that it hard-codes the item numbers into the comment, which makes it cumbersome to reorder it otherwise modify the list items in the ordered list. So if I wanted to add an item below the first item, I would end up with this:

1. This is my first item.
2. Newly inserted item.
2. This is item number two.
3. My third item.

It would be an improvement to have ordered lists always use 1. to denote a new ordered list item (i.e. do not auto-increment the number), so that modifying the list does not result in item numbers that are out of order. Markdown will still correctly identify the list as an ordered list. The resulting markup should look like this:

1. This is my first item.
1. Newly inserted item.
1. This is item number two.
1. My third item.

Is this feasible?

As for where this feature should appear, the comment field at the bottom of this very issue page is a great example. 😄 Of course, it should apply to any comment field where GitHub auto-increments ordered list markup.