pub const NON_REGION_CITY_PREFIX: u8 = b'_'; // 95u8
Expand description
IanaToBcp47MapV3
’s trie cannot handle differently-cased prefixes, like Mexico/BajaSur`` and
MET`.
Therefore, any ID that is not of the shape {region}/{city}
gets prefixed with this character
inside the trie.
During lookup, if the input is not of the shape {region}/{city}
, the trie cursor has to be advanced over
this byte.