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I'd like to a group-by on a vec of vecs where the group key gets removed, like if I group by index 0 I should get [[1 2] [1 3]] => [{1 [2 3]}]. I know I can do this pretty well with xforms, curious how meander compares


There is a new primitive planned for zeta (and experimentally demonstrated in code) which generalizes variable storage as a reduction that can be user defined. This ends up allowing for variables which automatically group-by, max, etc. Progress on zeta has been slow due to personal time constraints imposed on me by homeschooling and work at the moment.