C# UTF-8 rune enumeration

gistfile1.txt

public static class Extensions
{
	public static Rune[] ToArray(this SpanUtf8BytesRuneEnumerator enumerator)
	{
		Span<Rune> runes = stackalloc Rune[enumerator.remaining.Length];
		var i = 0;
		foreach (var utf8BytesRune in enumerator)
			runes[i++] = utf8BytesRune;
		var result = new Rune[i];
		runes.Slice(0, i).CopyTo(result);
		return result;
	}

	public static SpanUtf8BytesRuneEnumerator EnumerateRunes(this Span<Byte> utf8Bytes)
	{
		return new SpanUtf8BytesRuneEnumerator(utf8Bytes);
	}

	public ref struct SpanUtf8BytesRuneEnumerator
	{
		internal ReadOnlySpan<Byte> remaining;
		private Rune current;

		internal SpanUtf8BytesRuneEnumerator(ReadOnlySpan<Byte> utf8Bytes)
		{
			remaining = utf8Bytes;
			current = default;
		}

		public SpanUtf8BytesRuneEnumerator GetEnumerator() => this;

		public Rune Current => current;

		public Boolean MoveNext()
		{
			var operationStatus = Rune.DecodeFromUtf8(remaining, out current, out var bytesConsumed);
			remaining = remaining.Slice(bytesConsumed);
			return operationStatus == OperationStatus.Done;
		}
	}
}