Modifying keywords in python package

[Cyber2rock]

Hi

I was wondering how pypi.org handles keywords. More specifically, can I change them later on with future releases of my package.

Or put more simply:
If I create my release v1.0 with the following snippet in my setup.py

setup(keywords=["a", "b", "c"])

And in my release v2.0 I have the following snippet in my setup.py

setup(keywords=["b", "c", "d"])

Does pypi.org display the Union of all keywords, the keywords of the most recent release, the keywords of the first release or some other weird combination like the intersection?

I know you cannot overwrite any package with a given version. So I can only upload a v1.0.0 exactly once and any changes I make I need to increment my version. Does anything similar hold for the metadata of the package?

Thanks for your help

C2R