Address review comments
Address review comments

Fix typos and remove unneeded assertions.

pfmoore/pip,pypa/pip,pypa/pip,xavfernandez/pip,xavfernandez/pip,pfmoore/pip,sbidoul/pip,xavfernandez/pip,pradyunsg/pip,sbidoul/pip,pradyunsg/pip,rouge8/pip,rouge8/pip,rouge8/pip