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Summary: need tests to ensure flexboxes play nicely with box-sizing
It was recently clarified that the flex-basis (aka preferred size) applies to the box-size. I.e., if you are using border-box sizing, then the flex-basis is the length of the border-box.
*** Bug 92322 has been marked as a duplicate of this bug. ***
Created an attachment (id=155699) [details]
(From update of attachment 155699 [details])
You're right, that was simple.
Committed r124793: <http://trac.webkit.org/changeset/124793>