When using cmstartsortkey for a category, I get the impression the result is incorrect.
I requested:
http://en.wikipedia.org/w/api.php?cmprop=title%7Cids%7Csortkey%7Ctimestamp&a...
The way I understand it (and the way pywikipediabot uses it) this should give the disambiguation pages starting at Da. In reality however, it gives them starting at D + <some unicode character beyond z>. Am I misunderstanding the working of this api part or is this a bug?