Round-trip geohash encode/decode length 12

[dsmiley]

See https://issues.apache.org/jira/browse/LUCENE-1815 Can we guarantee round-trip geohash decode = encode = decode if the length is 12? It appears from some examples that this code can (as referenced in the Lucene issue): https://code.google.com/p/geospatialweb/source/browse/trunk/geohash/src/Geohash.java (LGPL) I hate some inefficiencies in that code but that aside it's not clear how it can round-trip it while our code doesn't.

Dunno about this one: https://github.com/kungfoo/geohash-java (LGPL)