improve RedisFeatures text output

StackExchange.Redis.Tests/RedisFeaturesTests.cs

+using System;
+using Xunit;
+
+namespace StackExchange.Redis.Tests
+{
+    public class RedisFeaturesTests
+    {
+        [Fact]
+        public void ExecAbort() // a random one because it is fun
+        {
+            var features = new RedisFeatures(new Version(2, 9));
+            var s = features.ToString();
+            Assert.True(features.ExecAbort);
+            Assert.StartsWith("Features in 2.9\r\n", s);
+            Assert.Contains("ExecAbort: True\r\n", s);
+
+            features = new RedisFeatures(new Version(2, 9, 5));
+            s = features.ToString();
+            Assert.False(features.ExecAbort);
+            Assert.StartsWith("Features in 2.9.5\r\n", s);
+            Assert.Contains("ExecAbort: False\r\n", s);
+
+            features = new RedisFeatures(new Version(3, 0));
+            s = features.ToString();
+            Assert.True(features.ExecAbort);
+            Assert.StartsWith("Features in 3.0\r\n", s);
+            Assert.Contains("ExecAbort: True\r\n", s);
+        }
+    }
+}

StackExchange.Redis/StackExchange/Redis/RedisFeatures.cs

 using System;
+using System.Linq;
+using System.Reflection;
 using System.Text;
 
 namespace StackExchange.Redis
@@ -32,6 +34,7 @@ public struct RedisFeatures
                                          v4_9_1 = new Version(4, 9, 1); // 5.0 RC1 is version 4.9.1
 
         private readonly Version version;
+
         /// <summary>
         /// Create a new RedisFeatures instance for the given version
         /// </summary>
@@ -166,13 +169,33 @@ public RedisFeatures(Version version)
         /// </summary>
         public override string ToString()
         {
-            var sb = new StringBuilder().Append("Features in ").Append(Version).AppendLine()
-                .Append("ExpireOverwrite: ").Append(ExpireOverwrite).AppendLine()
-                .Append("Persist: ").Append(Persist).AppendLine();
-
+            var v = Version; // the docs lie: Version.ToString(fieldCount) only supports 0-2 fields
+            var sb = new StringBuilder().Append("Features in ").Append(v.Major).Append('.').Append(v.Minor);
+            if (v.Revision >= 0) sb.Append('.').Append(v.Revision);
+            if (v.Build >= 0) sb.Append('.').Append(v.Build);
+            sb.AppendLine();
+            object boxed = this;
+            foreach(var prop in s_props)
+            {
+                sb.Append(prop.Name).Append(": ").Append(prop.GetValue(boxed)).AppendLine();
+            }
             return sb.ToString();
         }
-        // 2.9.5 (cluster beta 1) has a bug in EXECABORT re MOVED and ASK; it only affects cluster, but
-        // frankly if you aren't playing with cluster, why are you using 2.9.5 in the first place?
+
+        private static readonly PropertyInfo[] s_props = (
+            from prop in typeof(RedisFeatures).GetProperties(BindingFlags.Instance | BindingFlags.Public)
+            where prop.PropertyType == typeof(bool)
+            let indexers = prop.GetIndexParameters()
+            where indexers == null || indexers.Length == 0
+            orderby prop.Name
+            select prop).ToArray();
+
+        /// <summary>Returns the hash code for this instance.</summary>
+        /// <returns>A 32-bit signed integer that is the hash code for this instance.</returns>
+        public override int GetHashCode() => Version.GetHashCode();
+        /// <summary>Indicates whether this instance and a specified object are equal.</summary>
+        /// <returns>true if <paramref name="obj" /> and this instance are the same type and represent the same value; otherwise, false. </returns>
+        /// <param name="obj">The object to compare with the current instance. </param>
+        public override bool Equals(object obj) => obj is RedisFeatures f && f.Version == Version;
     }
 }