The fancy_lists extension doesn't work with gfm

[bkarpati]

Explain the problem.
Include the exact command line you used and all inputs necessary to reproduce the issue. Please create as minimal an example as possible, to help the maintainers isolate the problem. Explain the output you received and how it differs from what you expected.

Using the latest v3.6.3 of pandoc, fancy_lists is reported as a supported extension for the gfm format that is off by default. However, even after enabling it, it does not seem to have any effect on the output.

With the following source document

## Fancy list test

#. Item 1
#. Item 2
#. Item 3

And running the following command

pandoc -f gfm+fancy_lists -t html pandoc_test.md -o pandoc_test.html

The output HTML I get is

<h2 id="fancy-list-test">Fancy list test</h2>
<p>#. Item 1 #. Item 2 #. Item 3</p>

I would expect the output to be

<h2 id="fancy-list-test">Fancy list test</h2>
<ol>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ol>

Which is also what I get if I change the from format from gfm to markdown which has fancy_lists enabled by default.

Pandoc version?
Using pandoc v3.6.3 on macOS 15.3.1

[bkarpati]

A potential workaround is to just use 1. as every number in the list.

1. Item 1
1. Item 2
1. Item 3

Will produce

<ol type="1">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ol>

The downside is that some IDEs might complain about the list indices being incorrectly numbered.

[jgm]

fancy_lists works. (Try e.g. (i).)
But note what the documentation says (and note that gfm is implemented as extension on commonmark):

The fancy_lists extension also allows ‘#’ to be used as an ordered list marker in place of a numeral:

#. one
#. two

Note: the ‘#’ ordered list marker doesn’t work with commonmark.