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I incorporated that change as well. My rationale behind the previous version was to be consistent with how Lib/email/header.py handled this, unfortunately I did not look around in the other classes and didn't think about that kind of compatibility.
When formataddr() is called with a object which is not a string and which does not have a header_encode it will raise the following exception now:
> AttributeError: 'CharsetMock' object has no attribute 'header_encode'
Thank you for your patience, sorry that it took probably more of your time by taking 4 iterations for this patch than if you had just implemented it yourself.