davidmoten/geo — pull request #8 by dhagberg (2014-03-14 05:29:00+00:00)
Title: Attempt to get boundary geohashes to line up with PostGIS ST_GeoHash and geohash.org

At lat/lon 0,0 the output of geohash should be s00000000000 to match PostGIS
=> select ST_GeoHash(ST_SetSRID(ST_MakePoint(0,0),4326),12);
st_geohash
--------------
s00000000000

Similar issue was fixed in PostGIS to match geohash.org:
Reference: http://trac.osgeo.org/postgis/ticket/2201

Also:
Add asserts for hashes around boundary/pole conditions.