Updated to C# 12

AMWD.Common.MessagePack/Formatters/IPAddressFormatter.cs

@@ -0,0 +1,34 @@
+using System.Net;
+
+namespace MessagePack.Formatters
+{
+	/// <summary>
+	/// Serialization of an <see cref="IPAddress"/> to and from <see cref="MessagePack"/>.
+	/// </summary>
+	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+	public class IPAddressFormatter : IMessagePackFormatter<IPAddress>
+	{
+		/// <inheritdoc/>
+		public IPAddress Deserialize(ref MessagePackReader reader, MessagePackSerializerOptions options)
+		{
+			if (reader.IsNil)
+				return null;
+
+			byte[] bytes = options.Resolver.GetFormatterWithVerify<byte[]>().Deserialize(ref reader, options);
+			return new IPAddress(bytes);
+		}
+
+		/// <inheritdoc/>
+		public void Serialize(ref MessagePackWriter writer, IPAddress value, MessagePackSerializerOptions options)
+		{
+			if (value == null)
+			{
+				writer.WriteNil();
+				return;
+			}
+
+			byte[] bytes = value.GetAddressBytes();
+			options.Resolver.GetFormatterWithVerify<byte[]>().Serialize(ref writer, bytes, options);
+		}
+	}
+}