* Python 3.3 is now supported, thanks to Vinay Sajip
https://github.com/simplejson/simplejson/issues/8
* `sort_keys`/`item_sort_key` now sort on the stringified verison of the
key, rather than the original object. This ensures that the sort
only compares string types and makes the behavior consistent between
Python 2.x and Python 3.x.
* Like other number types, Decimal instances used as keys are now
coerced to strings when use_decimal is True.