Post editor; Heading not working for less than 3 charactors

[11122]

Hello, I have some questions with the Heading.
When I have a word less than 3 characters, the Heading does bot work with it. For example:

I have to add a “-” to make the heading apply:

I am not sure this is a bug. Anyone could explain this?
Thanks

[codinghorror]

Seems to be a bug specific to Marked

http://johnmacfarlane.net/babelmark2/?normalize=1&text=in --

[sam]

Fixed now:

in

CommonMark testing started here!

Per our migration plans, I just enabled markdown.it at Meta. It is an excellent CommonMark compliant engine. I expect quite a few edges to be found during this period of testing. Do not open bugs about the new Engine, just reply here. I/we will be updating the top post here with the list of issues and striking out stuff as it is fixed. Current known issues (to be fixed) :white_check_mark: Onebox vanishes after you start typing and works not-super consistently :white_check_mark: pending…

[sam]