geohash length is not as expected

[Jinyoyyo]

It seemed like encode method only can get correct length geohash when length is even.

In [14]: geohash.encode((1,1),1)
Out[14]: ''

In [15]: geohash.encode((1,1),2)
Out[15]: 's0'

In [16]: geohash.encode((1,1),3)
Out[16]: 's0'

In [17]: geohash.encode((1,1),4)
Out[17]: 's00t'

I guess the question is due to :

  length /= 2
  lon = _float_to_bits(lonlat[0], lower=-180.0, upper=180.0, length=length*5)
  lat = _float_to_bits(lonlat[1], lower=-90.0, upper=90.0, length=length*5)