RecyclableArrayList variables names standardized a little with RecyclableList.

Recyclable.Collections/RecyclableArrayList.cs

@@ -247,41 +247,41 @@ namespace Recyclable.Collections
 				return;
 			}
 
-			int capacity = _capacity;
-			int targetIndex = _count;
+			int targetItemIdx = _count;
 			Span<T> memorySpan;
 			if (source.TryGetNonEnumeratedCount(out var requiredAdditionalCapacity))
 			{
-				_ = EnsureCapacity(targetIndex + requiredAdditionalCapacity);
+				_ = EnsureCapacity(targetItemIdx + requiredAdditionalCapacity);
 				memorySpan = new(_memoryBlock);
 				foreach (var item in source)
 				{
-					memorySpan[targetIndex++] = item;
+					memorySpan[targetItemIdx++] = item;
 				}
 
-				_count = targetIndex;
+				_count = targetItemIdx;
 				return;
 			}
 
 			int i;
 			using var enumerator = source.GetEnumerator();
 
+			int capacity = _capacity;
 			memorySpan = new(_memoryBlock);
 			if (enumerator.MoveNext())
 			{
-				int available = capacity - targetIndex;
+				int available = capacity - targetItemIdx;
 				while (true)
 				{
-					if (targetIndex + growByCount > capacity)
+					if (targetItemIdx + growByCount > capacity)
 					{
 						capacity = EnsureCapacity(capacity + growByCount);
 						memorySpan = new(_memoryBlock);
-						available = capacity - targetIndex;
+						available = capacity - targetItemIdx;
 					}
 
 					for (i = 0; i < available; i++)
 					{
-						memorySpan[targetIndex++] = enumerator.Current;
+						memorySpan[targetItemIdx++] = enumerator.Current;
 						if (!enumerator.MoveNext())
 						{
 							break;
@@ -295,7 +295,7 @@ namespace Recyclable.Collections
 				}
 			}
 
-			_count = targetIndex;
+			_count = targetItemIdx;
 		}
 
 		public void Clear()