• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew tests with your changes locally?

Suppose you have devel and stable versions of foo installed.
Their versions should be grouped together regardless their specs.

Output before the change:

$ brew outdated foo
foo (2.4), foo (3.28-01) < 5.1

Output after the change:

$ brew outdated foo
foo (2.4, 3.28-01) < 5.1