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This is an update to the Proxy Contract. There is a test on step5 that isn't working even when the answer file is pasted into the file to get tested. This is also the problem on the master branch.
Also in step5.md (or in previous steps) - there is only very general instruction about the fallback function. So I think we need to fill this in a bit in this tutorial. @yann300 - what do you think?