Comment made by: gshayban
Yeah there's that -- won't be using get anyways after CLJ-700 gets committed.
We should add performance tests too. merging two maps, three, many maps, also varying the sizes of the maps, and for merge-with, varying the % of collisions.
Need to go back to the (some identity) logic, otherwise metadata is propagated from maps other than the first provided. I'll fix later.