Duplicate metadata is reflected by package
In this comment, @RonnyPfannschmidt reported that when the metadata for a package appears more than once in sys.path, that metadata gets emitted for each instance in which it appears.
I'm not sure what's to be done in this case, but I wanted to split it out as a separate issue from the issue caused by the presence of both importlib.metadata (Python 3.8) and its backport (importlib_metadata), which was addressed in #91 (closed).
Ronny, can you describe more about the conditions that cause this behavior to happen? What distro, how did you create the virtualenv? Would you consider supplying a Docker script that builds up such an environment?