RecyclableArrayList performance improvements.

Recyclable.Collections.Benchmarks/RefVsInstanceMemberBenchmarks.cs

@@ -0,0 +1,63 @@
+using BenchmarkDotNet.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Metadata.Ecma335;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Recyclable.Collections.Benchmarks
+{
+	public class RefVsInstanceMemberBenchmarks
+	{
+		private readonly TestCase _testCase = new();
+		private void DoNothing(int count)
+		{
+			_ = count;
+		}
+
+		private class TestCase
+		{
+			private int _count = 123;
+			public int Count
+			{
+				get => _count;
+				set => _count = value;
+			}
+
+			public ref int GetRefCount()
+			{
+				ref int count = ref _count;
+				count = 234;
+				_ = Add(count);
+				return ref count;
+			}
+
+			private int Add(int count)
+			{
+				return count;
+			}
+
+			public int GetCount()
+			{
+				_count = 234;
+				_ = Add(_count);
+				return _count;
+			}
+		}
+
+		[Benchmark]
+		public void Ref()
+		{
+			var count = _testCase.GetRefCount();
+			DoNothing(count);
+		}
+
+		[Benchmark(Baseline = true)]
+		public void InstanceMember()
+		{
+			var count = _testCase.GetCount();
+			DoNothing(count);
+		}
+	}
+}