[eigen] Using custom scalar types |

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Looking at the example in

`
``http://eigen.tuxfamily.org/dox/TopicCustomizingEigen.html#CustomScalarType
`one sees
... snip ...
IsInteger = 0,
IsSigned,
ReadCost = 1,
I suspect that IsSigned should be 1 for this example ?
Furthermore, one also sees
... snip ...
inline adouble internal::sin(const adouble& x) { return sin(x); }
inline adouble internal::cos(const adouble& x) { return cos(x); }

`inline adouble internal::pow(const adouble& x, adouble y) { return
``pow(x, y); }
` ... snip ...

`Is this a typo, or should the argument y be passed by value instead of
``by const reference ?
`