Better support for working with postal codes
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svraka commented
As postal codes can cross county and district boundaries, postal code based classifications require significant data cleaning. Ideally there should be crosswalk tables where overlapping postal codes are manually cleaned and validated. The following crosswalks are relevant:
- Regions: very few overlapping postal codes
- Counties: more but easily manageable
- Districts: even more, needs heavy manual cleaning.
- Metropolitan areas: also a lot of manual cleaning