[4.0] Move Dictionary(grouping:by) down a level #10450
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When testing quadratic behavior, remember to repeat small amounts of the behavior several times, not to increase the N, which is squared. 🙄
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@swift-ci Please test |
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This is a cherry pick of #10275, #10279, and #10306.
Dictionary(grouping:by:)initializer down to the buffer level to avoid repeatedly duplicating arrays while building the grouped dictionary.