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might be the docs

Hi, Alex,


The docs only say "can be zero" about the "black" value (which, in my case, is !=0), but not about cblack (which IS 0 for me). I think the docs could be improved by mentioning the same about the cblack values, would have helped me :-)
The 0 is in cblack even after "unpack()".

I don't see a problem here, it's really just minimizing headache for users ...

Update on my progress will come, I'm now trying to better understand the code with help of the ninedegrees article.