Fix in _idify()

This function used plain division '/' in an algorithm where floor
division '//' should be used instead.

source/base.py

@@ -116,7 +116,7 @@ def _idify(id):
         result = []
         while id > 0:
             remainder = id % config._MAX_ID
-            id = id / config._MAX_ID
+            id = id // config._MAX_ID
             result.append(int(remainder))
         result.reverse()
         return result