Add SpanToRef.GetOrNull

src/gaemstone.ECS/Iterator.cs

@@ -144,7 +144,8 @@ public unsafe class Iterator
 		public static SpanToRef<T> Empty => default;
 		private readonly Span<ReferenceHandle> _span;
 		public int Length => _span.Length;
-		public T? this[int index] => (T?)_span[index].Target;
+		public T this[int index] => (T)_span[index].Target!;
+		public T? GetOrNull(int index) => ((index >= 0) && (index < Length)) ? this[index] : null;
 		internal SpanToRef(Span<ReferenceHandle> span) => _span = span;
 	}
 }

src/gaemstone.Utility/SpanExtensions.cs

@@ -7,7 +7,7 @@ public static class SpanExtensions
 	public static T? GetOrNull<T>(this Span<T> span, int index)
 		where T : struct => GetOrNull((ReadOnlySpan<T>)span, index);
 	public static T? GetOrNull<T>(this ReadOnlySpan<T> span, int index)
-		where T : struct => (index >= 0 && index < span.Length) ? span[index] : null;
+		where T : struct => ((index >= 0) && (index < span.Length)) ? span[index] : null;
 
 
 	public static ReadOnlySpanSplitEnumerator<T> Split<T>(this ReadOnlySpan<T> span, T splitOn)