controlled_runge_kutta complex State error with Eigen.

I get an error in Line 89:
`return algebra.norm_inf( x_err );` cant convert std::complex to double
i attempted to work around this by inserted a abs()
`return abs(algebra.norm_inf( x_err )); `
is this correct?

My state type is Eigen::VectorXcd
my Value type is double.
I'm using
`#include `

Thank you in advance and best Regards!