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Many of our thin-client applications are built using the Dojo framework. Prior to 5.1, the version of Dojo in use was based on 1.6. This presented several changes for us ranging from build-time, unit testing, the runtime production and debug loading in the browser. None of this these was the fault of Dojo, but the rather fact that we mixed our Dojo usage with non-Dojo Javascript based on AMD modules, loaded and built by RequireJS.
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