LCCN incorrectly imported when containing alpha characters

[tfmorris]

Significant, non-numeric, characters are being dropped from LCCNs on import from MARC records. This is a long standing bug, so perhaps this is a duplicate report, but I can't find it in the current bug tracker. Perhaps it's in one of the previous trackers and didn't get transferred.

As an example, this MARC 010$a field

010 $aa 47003377

got imported here as 47003377 instead of a47003377.

These leading alpha prefixes are significant for LCCNs, so must be preserved.

Note that https://lccn.loc.gov/a%2047003377 doesn't resolve, so we need to either strip spaces when constructing the URL.

The full structure of the LCCN is described here: https://www.loc.gov/marc/lccn_structure.html

Stakeholders

@hornc

Not a showstopper, but should be fixed before doing any more MARC imports.

[hornc]

Thanks for adding this issue @tfmorris -- I wasn't aware of this unfortunately, it shouldn't be broken and I want to fix it ASAP!