[concurrency] conform Deque.Iterator to Sendable

Author: glessard

Sources/DequeModule/Deque+Collection.swift

@@ -164,7 +164,7 @@ extension Deque: Sequence {
   }
 }
 
-extension Deque.Iterator: Sendable where Element: Sendable {}
+extension Deque.Iterator: @unchecked Sendable where Element: Sendable {}
 
 extension Deque: RandomAccessCollection {
   public typealias Index = Int

Sources/DequeModule/Deque+Sendable.swift

@@ -103,3 +103,5 @@ public struct Deque<Element> {
     self._storage = _Storage(minimumCapacity: minimumCapacity)
   }
 }
+
+extension Deque: @unchecked Sendable where Element: Sendable {}