Geohashing functions for Jai. Only returns 64-bit integer formatted versions currently.
This is based on geohash-int by yinquiwen.
- It seems dumb to offer a "regular" and a "fast" version when both are functionally equivalent. Leaving both in for completeness of conversion for now, but the "regular" version should be removed.
- It would make sense to have stringify and destringify options.
- There seems to be a slight variation compared to the C version, where the 26-32nd bits drift slightly. Can't find a problem with the code, so it might come down to some compiler-level implementation differences. Or perhaps I just can't find it.