crumbs.path unable to find parent path for aliased path

When using crumbs.path plugin for path having alias like "a/b/c" breadcrumb looks like "Home>c".
The problem that crumbs module tries to load parent path menu item for "a/b" using menu_get_item() function and fails as it works with interal drupal paths only, not aliased. Module counts "a/b" path as non-existing and stops building breadcrumbs.
I propose to modify crumbs.path plugin to return internal parent path.

class path_class_CrumbsParentFinder {
  
  function getRuleTitle() {
    return 'existing alias for the given path';
  }
  
  function find($path) {
    $alias = drupal_get_path_alias($path);
    $fragments = explode('/', $alias);
    if (count($fragments) > 1) {
      array_pop($fragments);
      return drupal_get_normal_path(implode('/', $fragments));
    }
  }
}