S2 cell IDs are usually uint64, so the Ruby version looks wrong. If you cast that int64 to uint64 you get the same value as the python version. Level 1 IDs loo

S2 cell IDs are usually uint64, so the Ruby version looks wrong. If you cast that int64 to uint64 you get the same value as the python version. Level 1 IDs look like large random numbers in decimal, but when viewed in binary they have many trailing zeros, that are used to truncate to make the tokens.