for read decision: check the actual connection

Author: mgravell

src/StackExchange.Redis/BufferedStreamWriter.Sync.cs

@@ -7,6 +7,8 @@ namespace StackExchange.Redis;
 
 internal sealed class BufferedSyncStreamWriter : CycleBufferStreamWriter
 {
+    public override bool IsSync => true;
+
     private readonly TaskCompletionSource<bool> _completion = new(TaskCreationOptions.RunContinuationsAsynchronously);
 
     public BufferedSyncStreamWriter(Stream target, CancellationToken cancellationToken = default)

src/StackExchange.Redis/BufferedStreamWriter.cs

@@ -22,6 +22,8 @@ public enum WriteMode
         Pipe,
     }
 
+    public virtual bool IsSync => false;
+
     public static BufferedStreamWriter Create(WriteMode mode, ConnectionType connectionType, Stream target, CancellationToken cancellationToken)
     {
         // TODO: change to Async when debugged

src/StackExchange.Redis/PhysicalConnection.Read.cs

@@ -41,7 +41,7 @@ internal void StartReading(CancellationToken cancellation = default)
             cancellation = InputCancel;
         }
 
-        if (WriteMode is BufferedStreamWriter.WriteMode.Sync)
+        if (_output is { IsSync: true })
         {
             StartReadingSync(this, cancellation);
             static void StartReadingSync(PhysicalConnection conn, CancellationToken cancellation)