My concern about the filter(foobar_lt=-F('baz')) issue is that it violates
the principle of least surprise: it will be accepted silently and do
something that nobody could expect unless they know a bit about the
internals. However, I think having some special case code in filter(),
annotate() and anything else that takes expressions would be OK. Provided
it throws some kind of exception, I think it resolves my concern.
I'll go ahead and try to implement this using __neg__() to invert the
ordering.
Tim
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