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Library::CallNumber::LC is mostly designed to do call number
normalization, with the following goals:
* The normalized call numbers are comparable with each other, for
proper sorting
* The normalized call number is a short as possible, so left-anchored
wildcard searches are possible (e.g., searching on "A11*" should
give you all the A11 call numbers)
* A range defined by start_of_range and end_of_range should be
correct, assuming that the string given for the end of the range
is, in fact, a left prefix.
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