node_teaser still doesn't work correctly with UTF-8 strings

Even now that http://api.drupal.org/api/function/truncate_utf8/6 truncates to a specified number of characters instead of bytes (http://drupal.org/node/200185), http://api.drupal.org/api/function/node_teaser/6 can still return a string shorter than it is supposed to.

Simple fix: change

// If we have a short body, the entire body is the teaser.
  if (strlen($body) <= $size) {
    return $body;
  }

to

// If we have a short body, the entire body is the teaser.
  if (drupal_strlen($body) <= $size) {
    return $body;
  }