Enumerated lists without explicit number, ATX headings with explicit number

It seems like this syntax tries to solve a problem that AsciiDoc or Atlassian’s Confluence Wiki Markup already addresses.

Just for the record, Babelmark 3 shows that MD4C, which is aiming for Commonmark compliance, currently supports the no-number style:

. foo

) foo

but not with paired parentheses:

() foo

( ) foo

Pandoc, on the other hand, supports the number-sign style (when not running in strict mode):

#. foo

#) bar

(#) baz