StackExchange · mgravell · Aug 29, 2025 · Aug 29, 2025 · Aug 29, 2025 · Aug 29, 2025
diff --git a/Build.csproj b/Build.csproj
@@ -1,5 +1,6 @@
 <Project Sdk="Microsoft.Build.Traversal/3.0.2">
   <ItemGroup>
+    <ProjectReference Include="eng\**\*.csproj" />
     <ProjectReference Include="src\**\*.csproj" />
     <ProjectReference Include="tests\**\*.csproj" />
     <ProjectReference Include="toys\**\*.csproj" />

diff --git a/Directory.Build.props b/Directory.Build.props
@@ -1,5 +1,8 @@
 <Project>
   <PropertyGroup>
+    <!-- enables C# vNext features-->
+    <PreviewLangVersion>false</PreviewLangVersion>
+
     <VersionPrefix>2.0.0</VersionPrefix>
     <Copyright>2014 - $([System.DateTime]::Now.Year) Stack Exchange, Inc.</Copyright>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -26,7 +29,15 @@
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <IsPackable>false</IsPackable>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+    <CheckEolTargetFramework>false</CheckEolTargetFramework>
+    <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
     <PublicKey>00240000048000009400000006020000002400005253413100040000010001007791a689e9d8950b44a9a8886baad2ea180e7a8a854f158c9b98345ca5009cdd2362c84f368f1c3658c132b3c0f74e44ff16aeb2e5b353b6e0fe02f923a050470caeac2bde47a2238a9c7125ed7dab14f486a5a64558df96640933b9f2b6db188fc4a820f96dce963b662fa8864adbff38e5b4542343f162ecdc6dad16912fff</PublicKey>
+    <RollForward>LatestMajor</RollForward>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(PreviewLangVersion)' == 'true' ">
+    <LangVersion>preview</LangVersion>
+    <DefineConstants>$(DefineConstants);PREVIEW_LANGVER</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>

diff --git a/Directory.Packages.props b/Directory.Packages.props
@@ -7,11 +7,16 @@
     <PackageVersion Include="System.Diagnostics.PerformanceCounter" Version="5.0.0" />
     <PackageVersion Include="System.Threading.Channels" Version="5.0.0" />
     <PackageVersion Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
+    <PackageVersion Include="System.Buffers" Version="4.6.1" />
+    <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
 
+    <!-- Packages used by RESPite related libraries-->
+    <PackageVersion Include="System.Collections.Immutable" Version="9.0.8" />
+
     <!-- For analyzers, tied to the consumer's build SDK; at the moment, that means "us" -->
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
-    
+
     <!-- Packages only used in the solution, upgrade at will -->
     <PackageVersion Include="BenchmarkDotNet" Version="0.15.2" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.4.1" />
@@ -25,7 +30,6 @@
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="StackExchange.Redis" Version="2.6.96" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
-    <PackageVersion Include="System.Collections.Immutable" Version="9.0.0" />
     <PackageVersion Include="System.Reflection.Metadata" Version="9.0.0" />
 
     <!-- For binding redirect testing, main package gets this transitively -->

diff --git a/StackExchange.Redis.sln b/StackExchange.Redis.sln
@@ -122,9 +122,21 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "docs", "docs\docs.csproj",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StackExchange.Redis.Benchmarks", "tests\StackExchange.Redis.Benchmarks\StackExchange.Redis.Benchmarks.csproj", "{59889284-FFEE-82E7-94CB-3B43E87DA6CF}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "eng", "eng", "{5FA0958E-6EBD-45F4-808E-3447A293F96F}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESP.Core", "src\RESP.Core\RESP.Core.csproj", "{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StackExchange.Redis.Build", "eng\StackExchange.Redis.Build\StackExchange.Redis.Build.csproj", "{190742E1-FA50-4E36-A8C4-88AE87654340}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESPite.Tests", "tests\RESPite.Tests\RESPite.Tests.csproj", "{7063E2D3-C591-4604-A5DD-32D4A1678A58}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "eng", "eng", "{C0132984-68D1-4A97-8F8C-AD4E2EECC583}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StackExchange.Redis.Build", "eng\StackExchange.Redis.Build\StackExchange.Redis.Build.csproj", "{B0055B76-4685-4ECF-A904-88EE4E6FC8F0}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESPite", "src\RESPite\RESPite.csproj", "{F8762EE5-3461-4F6B-8C24-C876B6D9E637}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESPite.Redis", "src\RESPite.Redis\RESPite.Redis.csproj", "{3A92C2E7-3033-4FDF-8DDC-5DF43D290537}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESPite.StackExchange.Redis", "src\RESPite.StackExchange.Redis\RESPite.StackExchange.Redis.csproj", "{A5580114-C236-494E-851C-A21E3DB86FC8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RESPite.Benchmark", "src\RESPite.Benchmark\RESPite.Benchmark.csproj", "{3725A78B-B6B5-4379-9DE0-37A180ADE95A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -184,10 +196,34 @@ Global
 		{59889284-FFEE-82E7-94CB-3B43E87DA6CF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{59889284-FFEE-82E7-94CB-3B43E87DA6CF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{59889284-FFEE-82E7-94CB-3B43E87DA6CF}.Release|Any CPU.Build.0 = Release|Any CPU
-		{190742E1-FA50-4E36-A8C4-88AE87654340}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{190742E1-FA50-4E36-A8C4-88AE87654340}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{190742E1-FA50-4E36-A8C4-88AE87654340}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{190742E1-FA50-4E36-A8C4-88AE87654340}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7063E2D3-C591-4604-A5DD-32D4A1678A58}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7063E2D3-C591-4604-A5DD-32D4A1678A58}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7063E2D3-C591-4604-A5DD-32D4A1678A58}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7063E2D3-C591-4604-A5DD-32D4A1678A58}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B0055B76-4685-4ECF-A904-88EE4E6FC8F0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B0055B76-4685-4ECF-A904-88EE4E6FC8F0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B0055B76-4685-4ECF-A904-88EE4E6FC8F0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B0055B76-4685-4ECF-A904-88EE4E6FC8F0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F8762EE5-3461-4F6B-8C24-C876B6D9E637}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F8762EE5-3461-4F6B-8C24-C876B6D9E637}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F8762EE5-3461-4F6B-8C24-C876B6D9E637}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F8762EE5-3461-4F6B-8C24-C876B6D9E637}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3A92C2E7-3033-4FDF-8DDC-5DF43D290537}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3A92C2E7-3033-4FDF-8DDC-5DF43D290537}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3A92C2E7-3033-4FDF-8DDC-5DF43D290537}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3A92C2E7-3033-4FDF-8DDC-5DF43D290537}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A5580114-C236-494E-851C-A21E3DB86FC8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A5580114-C236-494E-851C-A21E3DB86FC8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A5580114-C236-494E-851C-A21E3DB86FC8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A5580114-C236-494E-851C-A21E3DB86FC8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3725A78B-B6B5-4379-9DE0-37A180ADE95A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3725A78B-B6B5-4379-9DE0-37A180ADE95A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3725A78B-B6B5-4379-9DE0-37A180ADE95A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3725A78B-B6B5-4379-9DE0-37A180ADE95A}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -210,7 +246,13 @@ Global
 		{A0F89B8B-32A3-4C28-8F1B-ADE343F16137} = {73A5C363-CA1F-44C4-9A9B-EF791A76BA6A}
 		{69A0ACF2-DF1F-4F49-B554-F732DCA938A3} = {73A5C363-CA1F-44C4-9A9B-EF791A76BA6A}
 		{59889284-FFEE-82E7-94CB-3B43E87DA6CF} = {73A5C363-CA1F-44C4-9A9B-EF791A76BA6A}
-		{190742E1-FA50-4E36-A8C4-88AE87654340} = {5FA0958E-6EBD-45F4-808E-3447A293F96F}
+		{E50EEB8B-6B3F-4C8C-A5C6-C37FB87C01E2} = {00CA0876-DA9F-44E8-B0DC-A88716BF347A}
+		{7063E2D3-C591-4604-A5DD-32D4A1678A58} = {73A5C363-CA1F-44C4-9A9B-EF791A76BA6A}
+		{B0055B76-4685-4ECF-A904-88EE4E6FC8F0} = {C0132984-68D1-4A97-8F8C-AD4E2EECC583}
+		{F8762EE5-3461-4F6B-8C24-C876B6D9E637} = {00CA0876-DA9F-44E8-B0DC-A88716BF347A}
+		{3A92C2E7-3033-4FDF-8DDC-5DF43D290537} = {00CA0876-DA9F-44E8-B0DC-A88716BF347A}
+		{A5580114-C236-494E-851C-A21E3DB86FC8} = {00CA0876-DA9F-44E8-B0DC-A88716BF347A}
+		{3725A78B-B6B5-4379-9DE0-37A180ADE95A} = {00CA0876-DA9F-44E8-B0DC-A88716BF347A}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {193AA352-6748-47C1-A5FC-C9AA6B5F000B}

diff --git a/StackExchange.Redis.sln.DotSettings b/StackExchange.Redis.sln.DotSettings
@@ -1,5 +1,10 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=OK/@EntryIndexedValue">OK</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=PONG/@EntryIndexedValue">PONG</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=RES/@EntryIndexedValue">RES</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=SE/@EntryIndexedValue">SE</s:String>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=pite/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=RESPite/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=pubsub/@EntryIndexedValue">True</s:Boolean>
-	<s:Boolean x:Key="/Default/UserDictionary/Words/=vectorset/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=vectorset/@EntryIndexedValue">True</s:Boolean>
+</wpf:ResourceDictionary>
diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
@@ -26,7 +26,7 @@ Current package versions:
 - Add support for XPENDING Idle time filter ([#2822 by david-brink-talogy](https://github.com/StackExchange/StackExchange.Redis/pull/2822))
 - Improve `double` formatting performance on net8+ ([#2928 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2928))
 - Add `GetServer(RedisKey, ...)` API ([#2936 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2936))
-- Fix error constructing `StreamAdd` message ([#2941 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2941)) 
+- Fix error constructing `StreamAdd` message ([#2941 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2941))
 
 ## 2.8.58
 

diff --git a/eng/StackExchange.Redis.Build/EasyArray.cs b/eng/StackExchange.Redis.Build/EasyArray.cs
@@ -0,0 +1,55 @@
+using System.Collections;
+
+namespace StackExchange.Redis.Build;
+
+/// <summary>
+/// Think <c>ImmutableArray{T}</c>, but with structural equality.
+/// </summary>
+/// <typeparam name="T">The data being wrapped.</typeparam>
+internal readonly struct EasyArray<T>(T[]? array) : IEquatable<EasyArray<T>>, IEnumerable<T>
+{
+    public static readonly EasyArray<T> Empty = new([]);
+    private readonly T[]? _array = array ?? [];
+    public int Length => _array?.Length ?? 0;
+    public ref readonly T this[int index] => ref _array![index];
+    public ReadOnlySpan<T> Span => _array.AsSpan();
+    public bool IsEmpty => Length == 0;
+
+    public static bool operator ==(EasyArray<T> x, EasyArray<T> y)
+        => x.Equals(y);
+
+    public static bool operator !=(EasyArray<T> x, EasyArray<T> y)
+        => x.Equals(y);
+
+    public bool Equals(EasyArray<T> other)
+    {
+        T[]? tArr = this._array, oArr = other._array;
+        if (tArr is null) return oArr is null || oArr.Length == 0;
+        if (oArr is null) return tArr.Length == 0;
+
+        if (tArr.Length != oArr.Length) return false;
+        for (int i = 0; i < tArr.Length; i++)
+        {
+            if (ReferenceEquals(tArr[i], oArr[i]))
+                return false;
+        }
+        return true;
+    }
+
+    public IEnumerator<T> GetEnumerator() => ((IEnumerable<T>)(_array ?? [])).GetEnumerator();
+
+    public override bool Equals(object? obj)
+        => obj is EasyArray<T> other && Equals(other);
+
+    public override int GetHashCode()
+    {
+        var arr = _array;
+        if (arr is null) return 0;
+        // use length and first item for a quick hash
+        return arr.Length == 0
+            ? 0
+            : arr.Length ^ EqualityComparer<T>.Default.GetHashCode(arr[0]);
+    }
+
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+}
diff --git a/eng/StackExchange.Redis.Build/IsExternalInit.cs b/eng/StackExchange.Redis.Build/IsExternalInit.cs
@@ -0,0 +1,7 @@
+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices;
+#if !NET5_0_OR_GREATER
+internal static class IsExternalInit
+{
+}
+#endif