faster aset

[joinr]

per Chris's note here:

https://clojurians.zulipchat.com/#narrow/stream/151924-data-science/topic/tech.2Eml.2Edataset/near/267758532

just defines overloads in java for a custom aset that doesn't return a value, incurring 0 boxing cost.

[joinr]

https://github.com/cnuernber/dtype-next/blob/master/java/tech/v3/datatype/ArrayHelpers.java#L7

[bsless]

I think I saw a JIRA recently where this will be solved by the compiler