Very problematic JS in "Open external links in a new window" function, adds 'nofollow' to rel attribute

1) Checking the config option "Open external links in a new window" now also adds the 'nofollow' rel attribute to all external links, which is not documented anywhere and presents a considerable SEO impact which should be contained in a different option, not in this one.

2) The JS code for said config option has several critical issues:

2.1)

Duplicate if check.

    if (drupalSettings.data.extlink.extTarget) {
      // Apply the target attribute to all links.
      if (drupalSettings.data.extlink.extTarget) {

2.2)

rel attribute is forced to "nofollow", overriding potentially existing other values.

After that, the rel attribute is checked for emptiness, which is impossible after the preceding "nofollow" set.

Finally, the code attempts to add the value "nofererer" to the rel attribute on several occasions, rather than "noreferrer". A typo.

        $(external_links).attr({target:'_blank', rel:'nofollow'});
        $(external_links).attr('rel', function (i, val) {
          // If no rel attribute is present, create one with the values noopener and noreferrer.
          if (val === null) {
            return 'noopener nofererer';
          }