2.11.1

• Introduced LazyListUnsafe<T> and extension .MemoizeUnsafe<T>() as an option to avoid incurring contention costs.
• Added Span<T> CopyToSpan<T>(this IEnumerable<T> source, Span<T> target) extension.
• Added Span<T> CopyTo<T>(Span<T> target) methods where possible.
• Added more documentation where missing.