function getSlidifyOptions( options ) {
		const markdownConfig = deck?.getConfig?.().markdown;

		options = options || {};
		options.separator = options.separator || markdownConfig?.separator || DEFAULT_SLIDE_SEPARATOR;
		options.verticalSeparator = options.verticalSeparator || markdownConfig?.verticalSeparator || DEFAULT_VERTICAL_SEPARATOR;
		options.notesSeparator = options.notesSeparator || markdownConfig?.notesSeparator || DEFAULT_NOTES_SEPARATOR;
		options.attributes = options.attributes || '';

		return options;

	}
Inspects the given options and fills out default
values for what's not defined.