they're pretty poor in what they allow you to currently do. I thought i had a long standing ticket about this, but i cant seem to find it at the moment

@andrewthad @treeowl if you could bring some of the lovely energy to bear on the mutable subsystem of Vector, theres a HUGE amount of ways we can experiment with improving things there, and that in turn can help motivate/justify ways to evolve primitive.

i've a lot of thoughts on this direction, but seldom the bandwidth to progress things as I'd like