Andreas Noack comments

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                                            Andreas Noack

Regression in 1.0, asking for Hessian of a complex matrix function results in infinite loop

The NaNs seem to be created when the matrix is converted to real symmetric tridiagonal form. When `d=2`, the matrix is diagonal with (1,2) element ```julia julia> tmp[1,2] Dual{ForwardDiff.Tag{var"#13#14"{ComplexF64, Int64},...

AssertionError: isfinite(phi_c) && isfinite(dphi_c)

Maybe this can be closed now that #177 has been included in a release

Multiplication of `PDMat` with a scalar recomputes the Cholesky factorization

Returning a `Matrix`, while in some sense correct, seems somewhat useless. I think I'd rather have an error thrown for non-positive scalars.

Multiplication of `PDMat` with a scalar recomputes the Cholesky factorization

IMO being too rigid about the meaning of the abstract types makes the specialized types less useful. Had an old discussion about this in the context of scalar multiplication of...