compatibility with hyperduals

[CheukHinHoJerry]

We should probably introduce a new Union type instead of doing something like:

_valtype(::GaussianBasis, T::Type{<: Real}) = T
_valtype(::GaussianBasis, T::Type{<: Hyper{<:Real}}) = T

every time.

Due to this there is an issue with rtrig + hyperduals that I did a quick fix so that Bernie can use it. I will probably create a PR later today together with the above issue.

[cortner]

how does this relate to #27

[CheukHinHoJerry]

I think not quite related to SINGLE/BATCH. This is just something to reduce code repetition.

[cortner]

FWIW this repetition doesn't bother me at all. It seems very minor, just like documenting what type of inputs we allow. Why is it a problem?

[CheukHinHoJerry]

hmm what you say sounds right. I fixed this problem for multiple basis and that's why I think this might be an issue. Now I look at it again it should be minor. Will close this issue now.