Why is the question summary forced to be >10 chars?

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On the Data entry and display rules page if I set the Minimum length of question body (number of characters) to 0, my installation still does not accept a question without a "body" (displaying an error message that the body must be >10 chars which appears to be the default).

If the question completely (and concisely) fits in the title field, it should be possible to make the description field optional to avoid adding clutter/duplication.