Optimize HashSet.UnionWith to copy data from another HashSet when empty #122952

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Merged

stephentoub merged 4 commits into main from copilot/fix-unionwith-copy-data

Jan 12, 2026

Merged

Optimize HashSet.UnionWith to copy data from another HashSet when empty #122952

Refactor UnionWith test to use MemberData with foreach loops

Azure Pipelines / runtime-dev-innerloop (Evaluate Paths Evaluate Paths) succeeded Jan 7, 2026 in 39s

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