diff --git a/.github/dev.yml b/.github/dev.yml
index 7b6b9f6..7ca15b3 100644
--- a/.github/dev.yml
+++ b/.github/dev.yml
@@ -1,7 +1,7 @@
 pr: none
 trigger: [ master ]
 
-name: 3.7.1-dev.$(Rev:r)
+name: 3.7.2-dev.$(Rev:r)
 
 pool:
   vmImage: ubuntu-latest
diff --git a/src/Client.cs b/src/Client.cs
index cd808eb..3f568f4 100644
--- a/src/Client.cs
+++ b/src/Client.cs
@@ -815,7 +815,7 @@ namespace WTelegram
 					_paddedMode = true;
 					secret = secret[1..17];
 				}
-				else if (secret.Length != 16) throw new ArgumentException("Invalid/unsupported secret", nameof(secret));
+				else if (secret.Length != 16) throw new ArgumentException("Invalid/unsupported secret");
 				Helpers.Log(2, $"Connecting to DC {dcId} via MTProxy {server}:{port}...");
 				_tcpClient = await TcpHandler(server, port);
 				_networkStream = _tcpClient.GetStream();
diff --git a/src/Helpers.cs b/src/Helpers.cs
index decf66c..f1569c0 100644
--- a/src/Helpers.cs
+++ b/src/Helpers.cs
@@ -235,11 +235,10 @@ namespace WTelegram
 		internal static string GetAppVersion()
 			=> (Assembly.GetEntryAssembly() ?? Array.Find(AppDomain.CurrentDomain.GetAssemblies(), a => a.EntryPoint != null))?.GetName().Version.ToString() ?? "0.0";
 
-		public class IndirectStream : Stream
+		public class IndirectStream(Stream innerStream) : Stream
 		{
-			public IndirectStream(Stream innerStream) => _innerStream = innerStream;
 			public long? ContentLength;
-			protected readonly Stream _innerStream;
+			protected readonly Stream _innerStream = innerStream;
 			public override bool CanRead => _innerStream.CanRead;
 			public override bool CanSeek => ContentLength.HasValue || _innerStream.CanSeek;
 			public override bool CanWrite => _innerStream.CanWrite;
diff --git a/src/TL.Extensions.cs b/src/TL.Extensions.cs
index a4baf3a..15ce256 100644
--- a/src/TL.Extensions.cs
+++ b/src/TL.Extensions.cs
@@ -11,7 +11,7 @@ namespace TL
 {
 	public static class Extensions
 	{
-		private class CollectorPeer : Peer
+		internal class CollectorPeer : Peer
 		{
 			public override long ID => 0;
 			internal IDictionary<long, User> _users;
diff --git a/src/TL.cs b/src/TL.cs
index 77e8087..d3872a1 100644
--- a/src/TL.cs
+++ b/src/TL.cs
@@ -16,26 +16,23 @@ namespace TL
 	public interface IPeerResolver { IPeerInfo UserOrChat(Peer peer); }
 
 	[AttributeUsage(AttributeTargets.Class)]
-	public class TLDefAttribute : Attribute
+	public class TLDefAttribute(uint ctorNb) : Attribute
 	{
-		public readonly uint CtorNb;
-		public TLDefAttribute(uint ctorNb) => CtorNb = ctorNb;
+		public readonly uint CtorNb = ctorNb;
 		public bool inheritBefore;
 	}
 
 	[AttributeUsage(AttributeTargets.Field)]
-	public class IfFlagAttribute : Attribute
+	public class IfFlagAttribute(int bit) : Attribute
 	{
-		public readonly int Bit;
-		public IfFlagAttribute(int bit) => Bit = bit;
+		public readonly int Bit = bit;
 	}
 
-	public class RpcException : WTelegram.WTException
+	public class RpcException(int code, string message, int x = -1) : WTelegram.WTException(message)
 	{
-		public readonly int Code;
+		public readonly int Code = code;
 		/// <summary>The value of X in the message, -1 if no variable X was found</summary>
-		public readonly int X;
-		public RpcException(int code, string message, int x = -1) : base(message) { Code = code; X = x; }
+		public readonly int X = x;
 		public override string ToString() { var str = base.ToString(); return str.Insert(str.IndexOf(':') + 1, " " + Code); }
 	}
 
@@ -372,13 +369,12 @@ namespace TL
 	}
 
 	[TLDef(0x5BB8E511)] //message#5bb8e511 msg_id:long seqno:int bytes:int body:Object = Message
-	public class _Message : IObject
+	public class _Message(long msgId, int seqNo, IObject obj) : IObject
 	{
-		public _Message(long msgId, int seqNo, IObject obj) { msg_id = msgId; seq_no = seqNo; body = obj; }
-		public long msg_id;
-		public int seq_no;
+		public long msg_id = msgId;
+		public int seq_no = seqNo;
 		public int bytes;
-		public IObject body;
+		public IObject body = obj;
 	}
 
 	[TLDef(0x73F1F8DC)] //msg_container#73f1f8dc messages:vector<%Message> = MessageContainer