Revert "Support for custom boundaries implemented. v1 - will be reverted due to 5x slower performance."

This reverts commit 22d8593e1f.

Recyclable.Collections/MemoryBucket.cs

@@ -2,21 +2,23 @@ namespace Recyclable.Collections
 {
 	internal sealed class MemoryBucket<T>
 	{
-		public MemoryBucket(Array memory, MemoryBucket<T> nextBucket)
+		public MemoryBucket(T[] memory, MemoryBucket<T> nextBucket)
 		{
 			_memory = memory;
 			_nextBucket = nextBucket;
 		}
 
-		public MemoryBucket(Array memory)
+		public MemoryBucket(T[] memory)
 		{
 			_memory = memory;
 		}
 
-		private Array _memory;
+#pragma warning disable RCS1085
-		public Array Memory { get => _memory; set => _memory = value; }
+		private T[] _memory;
+		public T[] Memory { get => _memory; set => _memory = value; }
 
 		private MemoryBucket<T>? _nextBucket;
 		public MemoryBucket<T>? NextBucket { get => _nextBucket; set => _nextBucket = value; }
+#pragma warning restore RCS1085
 	}
 }

Recyclable.Collections/Pools/OneSizeArrayPool.cs

@@ -39,7 +39,7 @@
 			_ = Task.Run(ReleaseMemoryOnExcess);
 		}
 
-		public Array Rent()
+		public T[] Rent()
 		{
 			MemoryBucket<T>? bucket;
 			Enter();
@@ -55,10 +55,10 @@
 			}
 
 			Exit();
-			return bucket != null ? bucket.Memory : Array.CreateInstance(typeof(T), _blockSize);
+			return bucket != null ? bucket.Memory : new T[_blockSize];
 		}
 
-		public void ReturnUnchecked(Array array, bool clearArray)
+		public void ReturnUnchecked(T[] array, bool clearArray)
 		{
 			MemoryBucket<T> bucket = new(array);
 			if (clearArray)

Recyclable.Collections/Pools/RecyclableArrayPool.cs

@@ -4,95 +4,24 @@ namespace Recyclable.Collections.Pools
 {
 	public readonly struct RecyclableArrayPool<T>
 	{
-		private const int MaxArraySize = 32;
+		internal static readonly OneSizeArrayPool<T>[] _pools = new OneSizeArrayPool<T>[32];
-		internal static readonly OneSizeArrayPool<T>[] _pools = new OneSizeArrayPool<T>[MaxArraySize];
+		public static T[] RentShared(int blockSize) => _pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)].Rent();
-		internal static readonly Dictionary<int, OneSizeArrayPool<T>[]> _poolsWithBoundaries = new();
-		
-		public static Array RentShared(int blockSize, int lowerBound)
-		{
-			OneSizeArrayPool<T>[]? pools;
-			lock(_poolsWithBoundaries)
-			{
-				if (!_poolsWithBoundaries.TryGetValue(lowerBound, out pools))
-				{
-					pools = _poolsWithBoundaries[lowerBound] = new OneSizeArrayPool<T>[MaxArraySize];
-					InitializePools(pools);
-				}
-			}
-
-			return pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)].Rent();
-		}
-
-		public static Array RentShared(int blockSize) => _pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)].Rent();
-		public static T[] RentSharedAsTyped(int blockSize) => (T[])_pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)].Rent();
-
 		public static void ReturnShared(in T[] memoryBlock, bool needsClearing)
-		{
+			=> _pools[31 - BitOperations.LeadingZeroCount((uint)memoryBlock.Length)].ReturnUnchecked(memoryBlock, needsClearing);
-			if (memoryBlock.GetLowerBound(0) == 0)
-			{
-				_pools[31 - BitOperations.LeadingZeroCount((uint)memoryBlock.Length)].ReturnUnchecked(memoryBlock, needsClearing);
-			}
-			else
-			{
-				OneSizeArrayPool<T>[] pools;
-				lock(_poolsWithBoundaries)
-				{
-					pools = _poolsWithBoundaries[memoryBlock.GetLowerBound(0)];
-				}
-				
-				pools[31 - BitOperations.LeadingZeroCount((uint)memoryBlock.Length)].ReturnUnchecked(memoryBlock, needsClearing);
-			}
-		}
-
-		public static void ReturnShared(in Array memoryBlock, bool needsClearing)
-		{
-			if (memoryBlock.GetLowerBound(0) == 0)
-			{
-				_pools[31 - BitOperations.LeadingZeroCount((uint)memoryBlock.Length)].ReturnUnchecked(memoryBlock, needsClearing);
-			}
-			else
-			{
-				OneSizeArrayPool<T>[] pools;
-				lock(_poolsWithBoundaries)
-				{
-					pools = _poolsWithBoundaries[memoryBlock.GetLowerBound(0)];
-				}
-				
-				pools[31 - BitOperations.LeadingZeroCount((uint)memoryBlock.Length)].ReturnUnchecked(memoryBlock, needsClearing);
-			}
-		}
 
 		public static ref OneSizeArrayPool<T> Shared(int blockSize)
 			=> ref _pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)];
 
-		public static ref OneSizeArrayPool<T> SharedWithBoundaries(int blockSize, int lowerBound)
-		{
-			OneSizeArrayPool<T>[]? pools;
-			lock(_poolsWithBoundaries)
-			{
-				if (!_poolsWithBoundaries.TryGetValue(lowerBound, out pools))
-				{
-					pools = _poolsWithBoundaries[lowerBound] = new OneSizeArrayPool<T>[MaxArraySize];
-					InitializePools(pools);
-				}
-			}
-			
-			return ref pools[31 - BitOperations.LeadingZeroCount((uint)blockSize)];
-		}
-
 		static RecyclableArrayPool()
 		{
-			InitializePools(_pools);
+			var pools = _pools;
-			_ = Task.Run(CheckAndReportMemoryPressure);
+			for (var arraySize = 0; arraySize < 32; arraySize++)
-		}
-
-		private static void InitializePools(OneSizeArrayPool<T>[] pools)
-		{
-			for (var arraySize = 0; arraySize < MaxArraySize; arraySize++)
 			{
 				int blockSize = 1 << arraySize;
 				pools[arraySize] = new OneSizeArrayPool<T>(blockSize, 1000);
 			}
+
+			_ = Task.Run(CheckAndReportMemoryPressure);
 		}
 
 		public static readonly OneSizeArrayPool<T> Null = new(0, 0);

Recyclable.Collections/RecyclableList.AddRange.cs

@@ -1,6 +1,10 @@
+using System;
 using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
 using System.Numerics;
 using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
 
 namespace Recyclable.Collections
 {
@@ -15,7 +19,7 @@ namespace Recyclable.Collections
 			var enumerator = items.GetEnumerator();
 
 			int capacity = list._capacity;
-			memorySpan = new((T[])list._memoryBlock);
+			memorySpan = new(list._memoryBlock);
 			if (enumerator.MoveNext())
 			{
 				int available = capacity - targetItemIndex;
@@ -24,7 +28,7 @@ namespace Recyclable.Collections
 					if (targetItemIndex + growByCount > capacity)
 					{
 						capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, targetItemIndex, checked((int)BitOperations.RoundUpToPowerOf2((uint)(targetItemIndex + growByCount))));
-						memorySpan = new((T[])list._memoryBlock);
+						memorySpan = new(list._memoryBlock);
 						available = capacity - targetItemIndex;
 					}
 
@@ -48,7 +52,7 @@ namespace Recyclable.Collections
 		{
 			list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, currentItemsCount, checked((int)BitOperations.RoundUpToPowerOf2((uint)(currentItemsCount + requiredAdditionalCapacity))));
 
-			Span<T> memorySpan = new((T[])list._memoryBlock);
+			Span<T> memorySpan = new(list._memoryBlock);
 			foreach (var item in items)
 			{
 				memorySpan[currentItemsCount++] = item;
@@ -78,7 +82,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items.Length))));
 			}
 
-			new Span<T>(items).CopyTo(new Span<T>((T[])list._memoryBlock, list._count, items.Length));
+			new Span<T>(items).CopyTo(new Span<T>(list._memoryBlock, list._count, items.Length));
 			list._count += items.Length;
 			list._version++;
 		}
@@ -91,7 +95,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items.Length))));
 			}
 
-			items.CopyTo(new Span<T>((T[])list._memoryBlock, list._count, items.Length));
+			items.CopyTo(new Span<T>(list._memoryBlock, list._count, items.Length));
 			list._count += items.Length;
 			list._version++;
 		}
@@ -104,7 +108,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items.Length))));
 			}
 
-			items.CopyTo(new Span<T>((T[])list._memoryBlock, list._count, items.Length));
+			items.CopyTo(new Span<T>(list._memoryBlock, list._count, items.Length));
 			list._count += items.Length;
 			list._version++;
 		}
@@ -117,7 +121,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items.Count))));
 			}
 
-			items.CopyTo((T[])list._memoryBlock, list._count);
+			items.CopyTo(list._memoryBlock, list._count);
 			list._count += items.Count;
 			list._version++;
 		}
@@ -143,7 +147,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items.Count))));
 			}
 
-			items.CopyTo((T[])list._memoryBlock, list._count);
+			items.CopyTo(list._memoryBlock, list._count);
 			list._count += items.Count;
 			list._version++;
 		}
@@ -156,7 +160,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + items._count))));
 			}
 
-			new Span<T>((T[])items._memoryBlock, 0, items._count).CopyTo(new Span<T>((T[])list._memoryBlock, list._count, items._count));
+			new Span<T>(items._memoryBlock, 0, items._count).CopyTo(new Span<T>(list._memoryBlock, list._count, items._count));
 			list._count += items._count;
 			list._version++;
 		}
@@ -183,7 +187,7 @@ namespace Recyclable.Collections
 			}
 
 			// TODO: Avoid unnecessary range operator - pass as arguments instead.
-			Span<T> targetSpan = new Span<T>((T[])list._memoryBlock)[oldCount..],
+			Span<T> targetSpan = new Span<T>(list._memoryBlock)[oldCount..],
 				itemsSpan;
 
 			int blockIndex,
@@ -221,7 +225,7 @@ namespace Recyclable.Collections
 			var enumerator = source.GetEnumerator();
 
 			int capacity = list._capacity;
-			memorySpan = new((T[])list._memoryBlock);
+			memorySpan = new(list._memoryBlock);
 			if (enumerator.MoveNext())
 			{
 				int available = capacity - targetItemIndex;
@@ -230,7 +234,7 @@ namespace Recyclable.Collections
 					if (targetItemIndex + growByCount > capacity)
 					{
 						capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, targetItemIndex, checked((int)BitOperations.RoundUpToPowerOf2((uint)(targetItemIndex + growByCount))));
-						memorySpan = new((T[])list._memoryBlock);
+						memorySpan = new(list._memoryBlock);
 						available = capacity - targetItemIndex;
 					}
 
@@ -259,7 +263,7 @@ namespace Recyclable.Collections
 				list._capacity = RecyclableListHelpers<T>.ResizeAndCopy(list, list._count, checked((int)BitOperations.RoundUpToPowerOf2((uint)(list._count + sourceItemsCount))));
 			}
 
-			Span<T> memorySpan = new((T[])list._memoryBlock, list._count, sourceItemsCount);
+			Span<T> memorySpan = new(list._memoryBlock, list._count, sourceItemsCount);
 			for (var sourceItemIndex = 0; sourceItemIndex < sourceItemsCount; sourceItemIndex++)
 			{
 				memorySpan[sourceItemIndex] = items[sourceItemIndex];

Recyclable.Collections/RecyclableList.Enumerator.cs

@@ -16,9 +16,9 @@ namespace Recyclable.Collections
 
 #nullable disable
 			[Pure]
-			public readonly T Current => (T)_list._memoryBlock.GetValue(_currentItemIndex - 1);
+			public readonly T Current => _list._memoryBlock[_currentItemIndex - 1];
 			[Pure]
-			readonly object IEnumerator.Current => (T)_list._memoryBlock.GetValue(_currentItemIndex - 1);
+			readonly object IEnumerator.Current => _list._memoryBlock[_currentItemIndex - 1];
 #nullable restore
 
 			public bool MoveNext()

Recyclable.Collections/RecyclableList.Helpers.cs

@@ -108,23 +108,13 @@ namespace Recyclable.Collections
 		{
 			// TODO: Measure performance
 			// T[] newMemoryBlock = RecyclableListHelpers<T>._arrayPool.Rent(_capacity <<= 1);
-			Array oldMemoryBlock = list._memoryBlock;
+			T[] oldMemoryBlock = list._memoryBlock;
-			if (oldMemoryBlock.GetLowerBound(0) == 0)
-			{
 			list._memoryBlock = (list._capacity <<= 1) < RecyclableDefaults.MinPooledArrayLength
-					? Array.CreateInstance(typeof(T), list._capacity)
+				? new T[list._capacity]
 				: RecyclableArrayPool<T>.RentShared(list._capacity);
-			}
-			else
-			{
-				list._memoryBlock = (list._capacity <<= 1) < RecyclableDefaults.MinPooledArrayLength
-					? Array.CreateInstance(typeof(T), new[] { list._capacity }, new[] { oldMemoryBlock.GetLowerBound(0) })
-					: RecyclableArrayPool<T>.RentShared(list._capacity, oldMemoryBlock.GetLowerBound(0));
-			}
 
 			// & WAS SLOWER WITHOUT
-			Array.Copy(oldMemoryBlock, list._memoryBlock, list._count);
+			new Span<T>(oldMemoryBlock, 0, list._count).CopyTo(list._memoryBlock);
-			// new Span<T>((T[])oldMemoryBlock, 0, list._count).CopyTo((T[])list._memoryBlock);
 
 			if (oldMemoryBlock.Length >= RecyclableDefaults.MinPooledArrayLength)
 			{
@@ -141,7 +131,7 @@ namespace Recyclable.Collections
 		[MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
 		public static int ResizeAndCopy(RecyclableList<T> sourceList, int oldSize, int newSize)
 		{
-			T[] oldMemoryBlock = (T[])sourceList._memoryBlock;
+			T[] oldMemoryBlock = sourceList._memoryBlock;
 			sourceList._memoryBlock = newSize >= RecyclableDefaults.MinPooledArrayLength
 				? RecyclableArrayPool<T>.RentShared(newSize)
 				: new T[newSize];
@@ -149,7 +139,7 @@ namespace Recyclable.Collections
 			// & WAS SLOWER WITHOUT
 
 			// & WAS SLOWER AS ARRAY
-			new Span<T>(oldMemoryBlock, 0, oldSize).CopyTo((T[])sourceList._memoryBlock);
+			new Span<T>(oldMemoryBlock, 0, oldSize).CopyTo(sourceList._memoryBlock);
 
 			if (oldMemoryBlock.Length >= RecyclableDefaults.MinPooledArrayLength)
 			{

Recyclable.Collections/RecyclableList.IList.cs

@@ -27,18 +27,18 @@ namespace Recyclable.Collections
 
 		object? IList.this[int index]
 		{
-			get => _memoryBlock.GetValue(index);
+			get => _memoryBlock[index];
 
 			set
 			{
 				if (value is T typedValue)
 				{
-					_memoryBlock.SetValue(typedValue, index);
+					new Span<T>(_memoryBlock)[index] = typedValue;
 				}
 				else if (value == null && _defaultIsNull)
 				{
 #nullable disable
-					_memoryBlock.SetValue(default, index);
+					new Span<T>(_memoryBlock)[index] = default;
 #nullable restore
 				}
 				else

Recyclable.Collections/RecyclableList.VersionedEnumerator.cs

@@ -17,10 +17,10 @@ namespace Recyclable.Collections
 
 #nullable disable
 			[Pure]
-			public readonly T Current => _enumeratorVersion == _list._version ? (T)_list._memoryBlock.GetValue(_currentItemIndex - 1) : throw new InvalidOperationException();
+			public readonly T Current => _enumeratorVersion == _list._version ? _list._memoryBlock[_currentItemIndex - 1] : throw new InvalidOperationException();
 
 			[Pure]
-			readonly object IEnumerator.Current => _enumeratorVersion == _list._version ? _list._memoryBlock.GetValue(_currentItemIndex - 1) : throw new InvalidOperationException();
+			readonly object IEnumerator.Current => _enumeratorVersion == _list._version ? _list._memoryBlock[_currentItemIndex - 1] : throw new InvalidOperationException();
 #nullable restore
 
 			public bool MoveNext()

Recyclable.Collections/RecyclableList.cs

@@ -10,10 +10,10 @@ namespace Recyclable.Collections
 	{
 		private static readonly bool _needsClearing = !typeof(T).IsValueType;
 
-		public static explicit operator ReadOnlySpan<T>(RecyclableList<T> source) => new((T[])source._memoryBlock, 0, source._count);
+		public static explicit operator ReadOnlySpan<T>(RecyclableList<T> source) => new(source._memoryBlock, 0, source._count);
 
 #nullable disable
-		internal Array _memoryBlock;
+		internal T[] _memoryBlock;
 #nullable restore
 
 		internal ulong _version;
@@ -22,103 +22,85 @@ namespace Recyclable.Collections
 		public RecyclableList()
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 		}
 
-		public RecyclableList(int initialCapacity = RecyclableDefaults.InitialCapacity, int lowerBound = 0)
+		public RecyclableList(int initialCapacity)
-		{
-			if (lowerBound == 0)
 		{
 			if (initialCapacity >= RecyclableDefaults.InitialCapacity)
 			{
 				_memoryBlock = initialCapacity >= RecyclableDefaults.MinPooledArrayLength
 					? RecyclableArrayPool<T>.RentShared(checked((int)BitOperations.RoundUpToPowerOf2((uint)initialCapacity)))
-						: Array.CreateInstance(typeof(T), initialCapacity);
+					: new T[initialCapacity];
 				_capacity = _memoryBlock.Length;
 			}
 			else
 			{
-					_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+				_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 				_capacity = RecyclableDefaults.InitialCapacity;
 			}
 		}
-			else
-			{
-				if (initialCapacity >= RecyclableDefaults.InitialCapacity)
-				{
-					_memoryBlock = initialCapacity >= RecyclableDefaults.MinPooledArrayLength
-						? RecyclableArrayPool<T>.RentShared(checked((int)BitOperations.RoundUpToPowerOf2((uint)initialCapacity)), lowerBound)
-						: Array.CreateInstance(typeof(T), new[] { initialCapacity }, new[] { lowerBound });
-					_capacity = _memoryBlock.Length;
-				}
-				else
-				{
-					_memoryBlock = Array.CreateInstance(typeof(T), new[] { RecyclableDefaults.InitialCapacity }, new[] { lowerBound });
-					_capacity = RecyclableDefaults.InitialCapacity;
-				}
-			}
-		}
 
 		public RecyclableList(in Array source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(RecyclableList<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(RecyclableLongList<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(ReadOnlySpan<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(in T[] source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(IReadOnlyList<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(List<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(ICollection source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public RecyclableList(ICollection<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
@@ -128,13 +110,13 @@ namespace Recyclable.Collections
 			{
 				_memoryBlock = initialCapacity >= RecyclableDefaults.MinPooledArrayLength
 					? RecyclableArrayPool<T>.RentShared(checked((int)BitOperations.RoundUpToPowerOf2((uint)initialCapacity)))
-					: Array.CreateInstance(typeof(T), initialCapacity);
+					: new T[initialCapacity];
 				_capacity = _memoryBlock.Length;
 			}
 			else
 			{
 				_capacity = RecyclableDefaults.InitialCapacity;
-				_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+				_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			}
 
 			zRecyclableListAddRange.AddRange(this, source, RecyclableDefaults.MinPooledArrayLength);
@@ -146,13 +128,13 @@ namespace Recyclable.Collections
 			{
 				_memoryBlock = initialCapacity >= RecyclableDefaults.MinPooledArrayLength
 					? RecyclableArrayPool<T>.RentShared(checked((int)BitOperations.RoundUpToPowerOf2((uint)initialCapacity)))
-					: Array.CreateInstance(typeof(T), initialCapacity);
+					: new T[initialCapacity];
 				_capacity = _memoryBlock.Length;
 			}
 			else
 			{
 				_capacity = RecyclableDefaults.InitialCapacity;
-				_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+				_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			}
 
 			zRecyclableListAddRange.AddRange(this, source);
@@ -161,23 +143,21 @@ namespace Recyclable.Collections
 		public RecyclableList(Span<T> source)
 		{
 			_capacity = RecyclableDefaults.InitialCapacity;
-			_memoryBlock = Array.CreateInstance(typeof(T), RecyclableDefaults.InitialCapacity);
+			_memoryBlock = new T[RecyclableDefaults.InitialCapacity];
 			zRecyclableListAddRange.AddRange(this, source);
 		}
 
 		public T this[int index]
 		{
-#nullable disable
 			[MethodImpl(MethodImplOptions.AggressiveInlining)]
-			get => (T)_memoryBlock.GetValue(index);
+			get => _memoryBlock[index];
 
 			[MethodImpl(MethodImplOptions.AggressiveInlining)]
 			set
 			{
-				_memoryBlock.SetValue(value, index);
+				_memoryBlock[index] = value;
 				_version++;
 			}
-#nullable restore
 		}
 
 		internal int _capacity;
@@ -207,11 +187,11 @@ namespace Recyclable.Collections
 				RecyclableListHelpers<T>.ResizeAndCopy(this);
 			}
 
-			_memoryBlock.SetValue(item, _count++);
+			_memoryBlock[_count++] = item;
 			_version++;
 		}
 
-		public Array AsArray => _memoryBlock;
+		public T[] AsArray => _memoryBlock;
 
 		[MethodImpl(MethodImplOptions.NoInlining)]
 		public void Clear()
@@ -250,10 +230,11 @@ namespace Recyclable.Collections
 
 			if (index < oldCount)
 			{
-				Array.Copy(_memoryBlock, index, _memoryBlock, index + 1, oldCount -= index);
+				new Span<T>(_memoryBlock, index, oldCount -= index)
+					.CopyTo(new Span<T>(_memoryBlock, index + 1, oldCount));
 			}
 
-			_memoryBlock.SetValue(item, index);
+			_memoryBlock[index] = item;
 			_count++;
 			_version++;
 		}
@@ -272,7 +253,7 @@ namespace Recyclable.Collections
 
 				if (_needsClearing)
 				{
-					_memoryBlock.SetValue(default, _count);
+					_memoryBlock[_count] = default;
 				}
 
 				_version++;
@@ -299,7 +280,7 @@ namespace Recyclable.Collections
 
 			if (_needsClearing)
 			{
-				_memoryBlock.SetValue(default, _count);
+				_memoryBlock[_count] = default;
 			}
 
 			_version++;

Recyclable.Collections/RecyclableLongList.AddRange.cs

@@ -189,7 +189,7 @@ namespace Recyclable.Collections
 
 			// We're better off to temporarily copy it to a fixed array,
 			// than copying them item by item. We may run into OOMs, though.
-			T[] itemsBuffer = items.Count >= RecyclableDefaults.MinPooledArrayLength ? (T[])RecyclableArrayPool<T>.RentShared((int)BitOperations.RoundUpToPowerOf2((uint)items.Count)) : new T[items.Count];
+			T[] itemsBuffer = items.Count >= RecyclableDefaults.MinPooledArrayLength ? RecyclableArrayPool<T>.RentShared((int)BitOperations.RoundUpToPowerOf2((uint)items.Count)) : new T[items.Count];
 			items.CopyTo(itemsBuffer, 0);
 
 			Span<T> itemsSpan = new(itemsBuffer, 0, items.Count);
@@ -255,7 +255,7 @@ namespace Recyclable.Collections
 
 			// We're better off to temporarily copy it to a fixed array,
 			// than copying them item by item. We may run into OOMs, though.
-			T[] itemsBuffer = items.Count >= RecyclableDefaults.MinPooledArrayLength ? (T[])RecyclableArrayPool<T>.RentShared((int)BitOperations.RoundUpToPowerOf2((uint)items.Count)) : new T[items.Count];
+			T[] itemsBuffer = items.Count >= RecyclableDefaults.MinPooledArrayLength ? RecyclableArrayPool<T>.RentShared((int)BitOperations.RoundUpToPowerOf2((uint)items.Count)) : new T[items.Count];
 
 			items.CopyTo(itemsBuffer, 0);
 
@@ -590,7 +590,7 @@ namespace Recyclable.Collections
 				targetList._capacity = RecyclableLongList<T>.Helpers.Resize(targetList, targetList._blockSize, targetList._blockSizePow2BitShift, checked((long)BitOperations.RoundUpToPowerOf2((ulong)targetCapacity)));
 			}
 
-			Span<T> itemsSpan = new((T[])items._memoryBlock, 0, items._count);
+			Span<T> itemsSpan = new(items._memoryBlock, 0, items._count);
 			Span<T[]> targetMemoryBlocksSpan = new(targetList._memoryBlocks);
 			Span<T> targetBlockArraySpan = new(targetMemoryBlocksSpan[targetBlockIndex], targetList._nextItemIndex, targetList._blockSize - targetList._nextItemIndex);
 			

Recyclable.Collections/RecyclableLongList.Helpers.cs

@@ -150,7 +150,7 @@ namespace Recyclable.Collections
 				if (requiredBlockCount > sourceBlockCount)
 				{
 					// Allocate new memory block for all arrays
-					newMemoryBlocks = requiredBlockCount >= RecyclableDefaults.MinPooledArrayLength ? (T[][])RecyclableArrayPool<T[]>.RentShared(requiredBlockCount) : new T[requiredBlockCount][];
+					newMemoryBlocks = requiredBlockCount >= RecyclableDefaults.MinPooledArrayLength ? RecyclableArrayPool<T[]>.RentShared(requiredBlockCount) : new T[requiredBlockCount][];
 
 					// Copy arrays from the old memory block for all arrays
 					if (sourceBlockCount > 0)
@@ -179,7 +179,7 @@ namespace Recyclable.Collections
 						ref OneSizeArrayPool<T> blockArrayPool = ref RecyclableArrayPool<T>.Shared(minBlockSize);
 						while (blockIndex >= 0 && newMemoryBlocks[blockIndex] == null)
 						{
-							newMemoryBlocks[blockIndex--] = (T[])blockArrayPool.Rent();
+							newMemoryBlocks[blockIndex--] = blockArrayPool.Rent();
 						}
 					}
 					else

Recyclable.CollectionsTests/RecyclableListTests.cs

@@ -338,13 +338,13 @@ namespace Recyclable.CollectionsTests
 
 			// Arrange
 			using var list = new RecyclableList<object>(testData, itemsCount);
-			_ = ((object[])list.AsArray)[..itemsCount].Should().AllSatisfy(x => x.Should().NotBeNull());
+			_ = list.AsArray[..itemsCount].Should().AllSatisfy(x => x.Should().NotBeNull());
 
 			// Act
 			list.Clear();
 
 			// Assert
-			_ = ((object[])list.AsArray)[..itemsCount].Should().AllSatisfy(x => x.Should().BeNull());
+			_ = list.AsArray[..itemsCount].Should().AllSatisfy(x => x.Should().BeNull());
 		}
 
 		[Theory]
@@ -393,12 +393,6 @@ namespace Recyclable.CollectionsTests
 			_ = list.Should().Equal(testData);
 		}
 
-		[Fact]
-		public void ConstructorShouldCreateArrayWithCustomBoundaries()
-		{
-			using var list = new RecyclableList<long>(-10);
-		}
-
 		[Theory]
 		[MemberData(nameof(RecyclableLongListTestData.SourceDataVariants), MemberType = typeof(RecyclableLongListTestData))]
 		public void ConstructorSourceShouldInitializeList(string testCase, IEnumerable<long> testData, int itemsCount)
@@ -481,14 +475,14 @@ namespace Recyclable.CollectionsTests
 			// Arrange
 			using var list = new RecyclableList<object>(testData, itemsCount);
 			var listArray = list.AsArray;
-			_ = ((object[])list.AsArray)[..itemsCount].Should().NotBeNull();
+			_ = list.AsArray[..itemsCount].Should().NotBeNull();
-			_ = ((object[])listArray)[..itemsCount].Should().AllSatisfy(x => x.Should().NotBeNull());
+			_ = listArray[..itemsCount].Should().AllSatisfy(x => x.Should().NotBeNull());
 
 			// Act
 			list.Dispose();
 
 			// Assert
-			_ = ((object[])listArray)[..itemsCount].Should().AllSatisfy(x => x.Should().BeNull());
+			_ = listArray[..itemsCount].Should().AllSatisfy(x => x.Should().BeNull());
 		}
 
 		[Fact]