internal static IInternalSpan OperationId(this IInternalSpan span, OperationBase op) => !span.IsNullSpan ? span.OperationId($"0x{op.Opaque:X}") : span;
internal static IInternalSpan OperationId(this IInternalSpan span, OperationBase op) => span.OperationId($"0x{op.Opaque:X}");