MemoryBucket & OneSizeArrayPool made sealed for better performance.

Recyclable.Collections/MemoryBucket.cs

@@ -1,6 +1,6 @@
 namespace Recyclable.Collections
 {
-	internal class MemoryBucket<T>
+	internal sealed class MemoryBucket<T>
 	{
 		public MemoryBucket(T[] memory, MemoryBucket<T> nextBucket)
 		{

Recyclable.Collections/Pools/OneSizeArrayPool.cs

@@ -2,7 +2,7 @@
 
 namespace Recyclable.Collections.Pools
 {
-    public class OneSizeArrayPool<T> : ArrayPool<T>
+	public sealed class OneSizeArrayPool<T>
 	{
 		private readonly int _blockSize;
 		private readonly int _minBlockCount;