Clarification of class/module/package level fixture support

[knedlsepp]

It is prominently listed on the main page that:

This plugin may not be used with class, module, and package level fixtures.

However as part of #66 certain issues with these fixtures were resolved as well as some tests added. So it seems to me that there is at least some level of support for these types of fixtures albeit undocumented what is the expected behavior.
I'm currently looking into this library as a replacement for https://github.com/box/flaky, which completely lacks the option to rerun tests on failed fixtures.

So maybe some of these questions could be answered as part of the docs:

• What is the current status of fixtures in this project?
• Are there plans in adding further support?
• Would pull-requests for these types of fixtures be accepted?

[ghost]

I'd like some clarification about this as well. What does it mean that it's not supported, and what work should be done in order to support it?