ComplexKey does not support partial compound keys with single field

I can't figure out how to do partial compound keys with a single value –

ex. 1 - Specifying both parts of the key:
http://localhost:8092/bucketname/_design/mydesigndoc/_view/myview?group_level=1&startkey=["0",1351742400000]&endkey=["Z",1353073898844]

ex. 2 - Only specifying the first part of the key:
http://localhost:8092/bucketname/_design/mydesigndoc/_view/myview?group_level=1&startkey=["0"]&endkey=["Z"]

I can get ex. 1 to work via the Java client library, but I've had no luck with ex. 2. I've tried setting ranges, complex keys and regular keys. The closest I get is a query string where the "[" and "]" have been escaped which results in a bad URL. I was only able to get this far by manually concatenating the "[" and "]" onto my key and using the query.setKey(String) method.

I believe that ComplexKey should be able to handle ex 2 by calling ComplexKey.of("0") and ComplexKey.of("Z").