> simplejson maintains Python 2.4+ compatibility, but json maintains 2.6+.
> I could produce another patch that manually removes these few remaining
> nits if it's necessary.

I don't quite understand this: isn't json/decoder.py and
simplejson/decoder.py essentially the same? why fork the one and not
the other?

However, as long as the compatibility requirements are documented
somewhere (e.g. PEP 291), it's fine with me.