Units of data

Has anyone extended (even privately) Boost.Units to include support
for units of data (bits, bytes, KB, MB, etc)?  It seems like this
would be a useful addition to Boost.Units.

Assuming no, what is the minimum amount of work required to do this
myself?  There's not a lot of info in the docs on how to define new
base units, although I've already begun looking over the source code
to try to come up with something.
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