Possible issues with float-precision on location coordinates

[lyricnz]

Lots of changes like:

    "geometry": {
     "type": "Point",
     "coordinates": [
-     145.197457,
+     145.19745699999999,
      -37.787261
     ]
    },

vs

sqlite> select * from address_principals where gnaf_pid == 'GAVIC420135795' limit 20;
GAVIC420135795|13 CONOS COURT|DONVALE|3111|VIC|-37.787261|145.197457

Hint at a problem with float-precision. Maybe we should round lat/long to 6dp, or use an arbitrary-precision type?

[lyricnz]

FWIW I have no idea how to override the representation of a float in json.dump(). Can't even monkeypatch it (sanely) because it uses an inner function. I tried making a custom JSONEncoder and a custom float-ish class, but only succeeded in making a string output.

[lyricnz]

I can't figure out how to reproduce this anymore...

[lyricnz]

Maaaaybe resolved by the update to running GHA with newer python?