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-rw-r--r--Hutch/Extensions/Foundation+Sendable.swift7
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diff --git a/Hutch/Extensions/Foundation+Sendable.swift b/Hutch/Extensions/Foundation+Sendable.swift
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+import Foundation
+
+// `UserDefaults` is documented as thread-safe but is not marked `Sendable` by
+// Foundation. Hutch passes it into account sessions and the various per-account
+// stores, all of which need to cross concurrency boundaries. The retroactive
+// unchecked conformance reflects the documented thread-safety.
+extension UserDefaults: @retroactive @unchecked Sendable {}