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In a future change, we can implement double in the core library, eliminating class Double (using the patch class feature). Review URL: https://chromiumcodereview.appspot.com//10876100 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11631 260f80e4-7a28-3924-810f-c04153c831b5