'seletskiy/godiff' author here.
In my judgment, the problem has been overstated. At the very least, with the 'tea,' it could be easily resolved by contacting me directly via e-mail, as mentioned in my GitHub profile.
I never intended for this code to be used by anyone else (there is no even a README file). But I'm delighted it helped someone attain their goals.
Anyway, I've stated that my code is MIT licensed.