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So yes, it pretty clearly didn't work before, and the whole configuration changed with the contract change, but it maintained the same prefix, which was clearly wider to begin with.
This is all documented, btw, in several PDFs and presentations from the ISPs. They really only give out /56 to phone customers. The only thing I discovered is they still *allocate* /56 to everyone, just don't let you use more than the low /64.
