I'm finding that I get gemdocs even with ri, but not for all packages.

I get them for Rails' plugins, for instance, but not for rails proper.
Does anyone know how I can control which ones appear?

Also, a problem is when a plugin or monkeypatch adds things to a class
- they know appear in the class's ri, even when that extension is only
part of a particular lib.  Is there a way to shut this off?