Feeds export_type is not loaded correctly when doing feeds_source

Hi

I'm doing a feeds import programatically, and it's working, (code below) but when I want to import several feeds in a loop, I get errors with this message: "Object is not persistent", these errors come from feeds_source not loading correctly the export_type property of the feeds and it always thinks that is FEEDS_EXPORT_NONE (mine should get EXPORT_IN_CODE).

What I've found is that feeds_source loads the feeds instance from FeedsSource object in the instance method which does a static call to $instance and this doesn't load the export_type correctly.

I understand this is a very particular use case, but now with feeds for D7 you can't do imports programatically that need more than one iteration (i.e large files).

Maybe a solution for this can be replacing static $instance call for a drupal_static and/or allowing to reset that variable when invoking feeds_source function.

code:

    $feedSource = feeds_source($feed);
    $config = $feedSource->getConfig();
    $config['FeedsFileFetcher']['source'] = $filename;
    $feedSource->setConfig($config);
    $feedSource->save();
    do {
      // Run the import process
      $status_import = $feedSource->existing()->import();
    } while  ($status_import != FEEDS_BATCH_COMPLETE);