Postal Codes #31

Having a look here - https://en.wikipedia.org/wiki/List_of_postal_codes

It looks like a majority of countries opt for numeric post/zipcodes. The problem then is what postcode is it?

There would need to be some context or guidance.

postcodeService.lookup("90210"); // many results?
postcodeService.lookup("90210", Country.USA); //beverly hills, california

Alternative

Build individual datasets of postcodes for countries and allow users to decide what relevant postcodes they want.

Likelihood of someone needing Afghanisation postcodes vs. likelihood of someone needing postcodes of a developed country?

String USA_POSTCODES = "/location4j-usa-postcodes.bin";
String UK_POSTCODES = "/location4j-uk-postcodes.bin";
SearchLocationService.builder().addData(UK_POSTCODES, USA_POSTCODES).build();