Just to be clear: `_diff_wrt` should just became
`_diff_notation_abuse` and be removed from Symbol

On 24 June 2012 00:19, [email protected]
<[email protected]> wrote:
> I would also like to make `_diff_wrt` an optional argument. As it
> stands it is impossible to make new types of derivatives because of
> this handy but non-rigorous abuse of notation. All that does not have
> the _diff_wrt attribute will just be treated as before (that means
> that _eval_derivative will actually be called without mangling the
> input which is extremely important!)

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