It seems pytest's very comprehensive CI sniffed out a few other places with similar bugs. Ideally we should find all the places where args are not stringy and solve it at the source, but who knows how many people are relying on the implicit string conversion. See [here](https://github.com/pytest-dev/pytest/blob/master/src/_pytest/config/__init__.py#L160-L166) for one such problem area (args with a single py.path.local instance is converted here, but a list or tuple containing some are not).
If `PYTEST_DISABLE_PLUGIN_AUTOLOAD` is set, disable auto-loading of
plugins through setuptools entrypoints. Only plugins that have been
explicitly specified are loaded.
ref #3784.
This was partially automated with https://github.com/asottile/yesqa
_with a few caveats_:
- it was run under python2 (chosen arbitrarily, when run under python3 other
things were changed)
- I used `git checkout -p` to revert the removal of `noqa` comments from
`cmp()` lines.
