rails/rails — pull request #8093 by nikitug (2012-11-01 09:04:51+00:00)
Title: Fix #8086 (BestStandardsSupport rewrites app X-UA-Compatible header)

Now `BestStandardsSupport` middleware appends it's `X-UA-Compatible` value to app's value.
Also test for `BestStandardsSupport` middleware added.