Bond::DefaultMission.completions should return strings
Currently, Bond::DefaultMission.completions returns strings and symbols as well. The latter doesn't make much sense, as you usually would expect completions to be strings.
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This is an artifact of ruby < 2.0. That method doesn't make any guarantees of returning all symbols and/or strings and doesn't effect Bond's primary completion behavior. If you have a need for that method to return all strings, feel free to make such a pull request along with a unit test.