Infinite loop in _rules_discover_module() function

My symlinking story:

For the initial conditions when:

1. Rules module is located in
   /var/www/lib/d7_dev/extensions/modules/rules/rules.module
2. while having all modules available via the link:
   /var/www/sites/example.com/sites/~all -> /var/www/lib/d7_dev/extensions/
3. and $class been passed to the function is 'RulesNodeConditionType'
4. and DRUPAL_ROOT equals to /var/www/sites/example.com

we get:

1. this entry in the $paths array:
   'sites/all/modules/rules' => 'rules'
2. $reflection->getFileName() returns:
   /var/www/lib/d7_dev/extensions/modules/rules/modules/node.eval.inc
3. $file_path = str_replace(DRUPAL_ROOT . '/', '', $reflection->getFileName()); returns just the same:
   /var/www/lib/d7_dev/extensions/modules/rules/modules/node.eval.inc
4. And drupal_get_path('module', 'rules') is obviously:
   sites/all/modules/rules

fago, I personally don't see any simple solution. Basically the task is in restoring original file structure for any files tree containing symlinks.
I could have for example:
/var/www/sites/example.com/sites/all/modules/rules as a real dir, while having:
/var/www/sites/example.com/sites/all/modules/rules/modules/@node.eval.inc as a symlink to another location, which is also a symlink to one more location, which is finally the symlink the Moon.
So you have to walk through the files, down (as a $class could be defined anywhere), testing is it a link, resolving each, recursively until you real the real file, and then walk up, finding it's place in the hierarchy of modules.

How to disable this part and rollback to the previous behavior?

Can't we simply use {registry} table?

function _rules_discover_module($class) {
  // Just looking up in the registry
  $classes = &drupal_static(__FUNCTION__);
  if (!isset($classes[$class])) {
    $result = db_query('SELECT module FROM {registry} WHERE name = :class', array(':class' => $class));
    $classes[$class] = ($record = $result->fetchAssoc()) ? $record['module'] : FALSE;
  }
  return $classes[$class];
}