Sorry, this seems confusing because things have changed fairly recently. I am referring to the screenshot shown at the plugin page that does not show the bulleted checklist syntax (and that the rake migrate task doesn’t seem to support):
Here’s the diff screenshot that made the change:
It’s hard to see but the left side has bulleted checkboxes, but the current right side gets rid of the bullets, suggesting a different default checkbox syntax for new users.
Added later:
In other words, all of these are now supported using the checklist plugin:
[] first
-[] second
- [] third
rendered as
first
- second
- third
while GFM tasklist spec only allows for the third variant (as a tasklist is a list):
A task list item is a list item where the first block in it is a paragraph which begins with a task list item marker and at least one whitespace character before any other content.
A task list item marker consists of an optional number of spaces, a left bracket (
[), either a whitespace character or the letterxin either lowercase or uppercase, and then a right bracket (]).
If one wants to conform to the GFM tasklist extension spec, then the first two should not be allowed and not promoted in the plugin documentation.