Make --ignore flag work with --pyargs

I just discovered the --pyargs option and it's very practical. However it does not seem to take into account the --ignore options.

Example,

$ pytest --doctest-modules  --pyargs setuptools
============================================ test session starts ============================================
platform linux -- Python 3.6.4, pytest-3.4.1, py-1.5.2, pluggy-0.6.0
rootdir: /home/rth, inifile:
plugins: profiling-1.2.11
collected 6 items                                                                                           

anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/namespaces.py .                       [ 16%]
anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/package_index.py .                    [ 33%]
anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/sandbox.py .                          [ 50%]
anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/command/develop.py .                  [ 66%]
anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/command/install_lib.py .              [ 83%]
anaconda2/envs/testn-env/lib/python3.6/site-packages/setuptools/command/py36compat.py .               [100%]

========================================= 6 passed in 0.52 seconds ==========================================

running,

pytest --doctest-modules --ignore develop.py  --pyargs setuptools

produces exactly identical output, while I would have expected the develop.py not to be tested.
Here is another example of this same issue.

Is there a way around it?

Start by reproducing the documented commands with pytest, --doctest-modules, --pyargs setuptools, and --ignore develop.py. Trace the collection paths for --pyargs and --ignore; done means the develop.py module is excluded while the other setuptools modules remain collected.