Preconnect for Google Fonts in v1.7

Hi,

In functions.php of v1.7 of this theme, you’ll find the following:

/**
 * Twenty Fifteen only works in WordPress 4.1 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '4.1-alpha', '<' ) ) {
	require get_template_directory() . '/inc/back-compat.php';
}

Notice that the version check above will allow WP 4.1 or newer to use the theme. Further down you’ll find the following new handler addition. 

/**
 * Add preconnect for Google Fonts.
 *
 * @since Twenty Fifteen 1.7
 *
 * @param array   $urls          URLs to print for resource hints.
 * @param string  $relation_type The relation type the URLs are printed.
 * @return array URLs to print for resource hints.
 */
function twentyfifteen_resource_hints( $urls, $relation_type ) {
	if ( wp_style_is( 'twentyfifteen-fonts', 'queue' ) && 'preconnect' === $relation_type ) {
		if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
			$urls[] = array(
				'href' => 'https://fonts.gstatic.com',
				'crossorigin',
			);
		} else {
			$urls[] = 'https://fonts.gstatic.com';
		}
	}

	return $urls;
}
add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );

FYI, wp_resource_hints() method is only available from WP 4.6 onwards and for some unknown reason, ‘crossorigin‘ is allowed for WP 4.7 or newer only. Anyway, I think there may be a problem for those who are using this theme on WP 4.1.x – 4.5.x

Proposed Solution 1: 
Change compatible version to 4.6 but legacy versions may not be able to use this theme:

/**
 * Twenty Fifteen only works in WordPress 4.6 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '4.6-alpha', '<' ) ) {
	require get_template_directory() . '/inc/back-compat.php';
}

or

Proposed Solution 2:  
Allow legacy WP versions to use this theme but do not use the preconnect if installed WP version is below 4.6:

if ( version_compare( $GLOBALS['wp_version'], '4.6-alpha', '>=' ) ) :
/**
 * Add preconnect for Google Fonts.
 *
 * @since Twenty Fifteen 1.7
 *
 * @param array   $urls          URLs to print for resource hints.
 * @param string  $relation_type The relation type the URLs are printed.
 * @return array URLs to print for resource hints.
 */
function twentyfifteen_resource_hints( $urls, $relation_type ) {
	if ( wp_style_is( 'twentyfifteen-fonts', 'queue' ) && 'preconnect' === $relation_type ) {
		if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
			$urls[] = array(
				'href' => 'https://fonts.gstatic.com',
				'crossorigin',
			);
		} else {
			$urls[] = 'https://fonts.gstatic.com';
		}
	}

	return $urls;
}
add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );
endif;

What do you think?