Cat API

[mattfel1]

Do we have an API for concatenate? Or is the only way to do it today is

1. Make a struct or pack the elements together
2. Cast them to the full bitwidth, <<, and ^ the numbers together

?

[dkoeplin]

At the moment the only API we have for this is

val concated = Vector.concatN(Seq(vec1, vec2, ...))

This assumes all the vectors have the same type. We should probably add a more general API