Kahle 大人已经在 github 上修复了这个 bug,并对我表示感谢[s:11]
[quote]
FIXES
* fixed a bug in stamen cloudmade maps that resulted in a very (very) small miscalculation in the bottom right bounding box of each tile.
+* several spaces have been removed from google maps urls; in particular, language="zh-CN" now works properly. (thanks to github user JiangXD.)
[/quote]