Currently it's somewhat surprising that while the documentation often states the default values for certain builtins, invoking the builtin with keyword arguments as described in the documentation does not work.

Original discussion: #7447

I'm going through all builtins to see how the keyword arg support looks and I'm going to present a patch for Doc/library/builtins.rst that explicitly states that builtins don't support this kind of invocation.

Expect a patch for that case later today. As for `os` et al, the discussion goes on.