Fixed #12632 -- Improved performance of `SortedDict`.  Thanks, Alex Gaynor.
Fixed #12632 -- Improved performance of `SortedDict`.  Thanks, Alex Gaynor.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@13742 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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