Fix race condition in AsyncThrowingCurrentValueSubject

Author: wfltaylor

Sources/AsyncSubjects/AsyncThrowingCurrentValueSubject.swift

@@ -97,8 +97,8 @@ public final class AsyncThrowingCurrentValueSubject<Element, Failure: Error>: As
   ) -> (iterator: AsyncThrowingBufferedChannel<Element, Error>.Iterator, unregister: @Sendable () -> Void) {
     let asyncBufferedChannel = AsyncThrowingBufferedChannel<Element, Error>()
 
-    let (terminalState, current) = self.state.withCriticalRegion { state -> (Termination?, Element) in
-      (state.terminalState, state.current)
+    let terminalState = self.state.withCriticalRegion { state -> Termination? in
+      state.terminalState
     }
 
     if let terminalState = terminalState {
@@ -111,11 +111,10 @@ public final class AsyncThrowingCurrentValueSubject<Element, Failure: Error>: As
       return (asyncBufferedChannel.makeAsyncIterator(), {})
     }
 
-    asyncBufferedChannel.send(current)
-
     let consumerId = self.state.withCriticalRegion { state -> Int in
       state.ids += 1
       state.channels[state.ids] = asyncBufferedChannel
+      asyncBufferedChannel.send(state.current)
       return state.ids
     }