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# Description Previously, `par-each` acted like a `flatmap`: first mapping the data, then applying a `flatten`. This is unlike `each`, which just maps the data. Now `par-each` works like `each` in this regard, leaving nested data unflattened. Fixes #8497 # User-Facing Changes Previously: `[1 2 3] | par-each {|e| [$e, $e] }` --> `[1,1,2,2,3,3]` Now: `[1 2 3] | par-each {|e| [$e, $e] }` --> `[[1,1],[2,2],[3,3]]` # Tests This adds one test that verifies the lack of flattening for `par-each`.