Mono - simplify, change ordering

Let's see if this is a race...I'm still unable to run locally, though.

StackExchange.Redis/StackExchange/Redis/ConnectionMultiplexer.cs

@@ -194,7 +194,7 @@ internal void OnErrorMessage(EndPoint endpoint, string message)
         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times")]
         private static void Write<T>(ZipArchive zip, string name, Task task, Action<T, StreamWriter> callback)
         {
-            var entry = zip.CreateEntry(name, PlatformHelper.GetCompressionLevel(nameof(CompressionLevel.Optimal)));
+            var entry = zip.CreateEntry(name, CompressionLevel.Optimal);
             using (var stream = entry.Open())
             using (var writer = new StreamWriter(stream))
             {

StackExchange.Redis/StackExchange/Redis/PlatformHelper.cs

 using System;
-using System.IO;
 using System.IO.Compression;
-using System.Net.Security;
 
 namespace StackExchange.Redis
 {
     internal class PlatformHelper
     {
-        public static SocketMode DefaultSocketMode = IsMono && IsUnix ? SocketMode.Async : SocketMode.Poll;
+        public static SocketMode DefaultSocketMode => IsMono && IsUnix ? SocketMode.Async : SocketMode.Poll;
 
-        public static bool IsMono { get; } = Type.GetType("Mono.Runtime") != null;
-        public static bool IsUnix { get; } = (int)Environment.OSVersion.Platform == 4
-                                          || (int)Environment.OSVersion.Platform == 6
-                                          || (int)Environment.OSVersion.Platform == 128;
-
-        /// <summary>
-        /// Gets the compression level from a string, avoiding a naming bug inside ancient mono versions.
-        /// </summary>
-        /// <remarks>
-        /// See: https://github.com/mono/mono/commit/714efcf7d1f9c9017b370af16bb3117179dd60e5
-        /// </remarks>
-        /// <param name="level">The level.</param>
-        /// <returns></returns>
-        public static CompressionLevel GetCompressionLevel(string level)
-        {
-            try
-            {
-                return (CompressionLevel)Enum.Parse(typeof(CompressionLevel), level);
-            }
-            catch (ArgumentException)
-            {
-                // Oops, ancient mono here.. let's tray again.
-                return (CompressionLevel)Enum.Parse(typeof(CompressionLevel), level.Replace(nameof(CompressionLevel.Optimal), "Optional"));
-            }
-        }
+        public static bool IsMono => Type.GetType("Mono.Runtime") != null;
+        public static bool IsUnix => (int)Environment.OSVersion.Platform == 4
+                                  || (int)Environment.OSVersion.Platform == 6
+                                  || (int)Environment.OSVersion.Platform == 128;
     }
 }