[Enhancement] SumS (etc) to work on List<T> please

[Simon Coghlan]

[Enhancement] SumS (etc) to work on List please

[Jack Mott]

it isn’t possible without extremely unsafe code. to expand on this, you can get at the array inside of the List using some hacks, but it isn't guaranteed to work on all implementations of .NET, or future implementations. If you really need growable array behavior with simd features, best thing to do is just copy the source to List, and make the array public.

[Simon Coghlan]

Duplicate of #15