Provide information on installed extras in package metadata

[pradyunsg (Pradyun Gedam)]

See the following:

Storing "installed extras" metadata in installations

How to detect which extras were installed at runtime?

I do have an use case where I do want to know if a package was installed with extras or not, but not by checking if all the dependencies from those extras are present as this would be extremely slow. Does pip store this information anywhere?