Handle better postal codes data in rural areas
See for instance
data
0
name "Bourg En Bresse"
area "FR-SE"
postal_code "01000"
lat 46.2069478835
lng 5.22442559307
id 4450
1
name "Bourg En Bresse"
area "FR-SE"
postal_code "01000"
lat 46.2069478835
lng 5.22442559307
id 4453
2
name "St Denis Les Bourg"
area "FR-SE"
postal_code "01000"
lat 46.2069478835
lng 5.22442559307
id 35748
3
name "Francheleins"
area "FR-SE"
postal_code "01090"
lat 46.0869886552
lng 4.79611073763
id 123
4
name "Genouilleux"
area "FR-SE"
postal_code "01090"
lat 46.0869886552
lng 4.79611073763
id 126
5
name "Lurcy"
area "FR-SE"
postal_code "01090"
lat 46.0869886552
lng 4.79611073763
id 168