fix bench

Author: Alex Peck

BitFaster.Caching.Benchmarks/BitFaster.Caching.Benchmarks.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFrameworks>net48;net6.0;net8.0</TargetFrameworks>
+    <LangVersion>10.0</LangVersion>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <!-- https://stackoverflow.com/a/59916801/131345 -->
     <IsWindows Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::Windows)))' == 'true'">true</IsWindows> 

BitFaster.Caching.Benchmarks/Lru/LruJustGetOrAdd.cs

@@ -66,8 +66,8 @@ Microsoft.Extensions.Caching.Memory.MemoryCache exMemoryCache
         [GlobalSetup]
         public void GlobalSetup()
         {
-            memoryCache.Set(key.ToString(), "test", new System.Runtime.Caching.CacheItemPolicy());
-            exMemoryCache.Set(key, "test");
+            memoryCache.Set(key.ToString(), "1", new System.Runtime.Caching.CacheItemPolicy());
+            exMemoryCache.Set(key, "1");
         }
 
         [GlobalCleanup]
@@ -147,15 +147,15 @@ public int ClassicLru()
         }
 
         [Benchmark()]
-        public int RuntimeMemoryCacheGet()
+        public object RuntimeMemoryCacheGet()
         {
-            return (int)memoryCache.Get("1");
+            return memoryCache.Get("1");
         }
 
         [Benchmark()]
-        public int ExtensionsMemoryCacheGet()
+        public object ExtensionsMemoryCacheGet()
         {
-            return (int)exMemoryCache.Get(1);
+            return exMemoryCache.Get(1);
         }
 
         public class MemoryCacheOptionsAccessor