Thank you for your feedback. Althogh I can see your point, we basically provide the internal builds just so that our customers can test their issues and see if they are fixed. As these versions aren't extensively tested and therefore they aren't stable, we release the source code only with the stable official releases - beta, quarterly release and SP releases. We believe that this is the best approach so that you can learn from a stable source code version rather than from untested nightly build.
All the best,
the Telerik team
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