Only one is_a here.
function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
.....
// if ( !is_a($wp_styles, 'WP_Styles') )
$class_name = 'WP_Styles';
if ( ( get_class($wp_styles) != $class_name )
&& !is_subclass_of($wp_styles, $class_name) )
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[...] wp-includes/general-template.php [...]