How do I generate 9 digit geohash ?

[vherasme]

I would like to know how to modify the code in order to generate 9 digit geohashes. When I set the length = 9, the encode method returns 8 digits. similarly if I set length = 11, encode returns 10.

On the other hand, when the length is set to 10 or 12, the digits returned are exactly 10 or 12 respectively.

Could you please explain why this happens ?

[zkeqing]

because of in function encode,
length /=2 make it just generate even num digits