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I created this branch to fix the approximate address api calls to openstreetmap that were failing.
I looked into switching from XMLHttpRequests to fetch, which is more modern.
Switching to fetch 'magically' fixed the api call bug that I was having.
After that, I refactored all the overlay code to use fetch. Then refactored again by creating helper functions to make the code a lot more readable.
P.S.
I do understand that refactoring strictly speaking isn't what this branch was made for, but refactoring unexpectedly solved my bug and I just went along and rewrote the whole thing because it was quite a mess.