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Summary: In rule 18a. of the TeX book, it says we're supposed to set `u` and `v` to 0 if the nucleus is a character box. Character boxes are loosely defined, but through experimentation they are anything that contains a single character, including ordgroups with a single element in them. This change makes KaTeX follow this rule, and fixes T2404. Test Plan: - Make sure the new huxley screenshot looks good - Make sure none of the huxley tests have changed Reviewers: alpert Reviewed By: alpert Maniphest Tasks: T2404 Differential Revision: http://phabricator.khanacademy.org/D8275