Anonymous page cache & filefield_aliases

I noticed that there seems to be some issues with Drupal's page caching and filefield_aliases. The problem occurs with caching turned on and if an anonymous user hits a cached pdf (possibly other types too) the returned data has the wrong header type and so the data is displayed as plain text. The way I got around this problem was to use this module: http://drupal.org/project/cacheexclude to exclude filefield_paths/* from being cached. After emptying the page cache the files were able to be accessed fine with page caching turned on.

A better way to do this would be to put a hook_init function in the filefield_aliases module that had some path matching logic and on a filefield_paths match stops the request being cached:
$GLOBALS['conf']['cache'] = FALSE;

Other than this issue I've found the module to be excellent so far, thanks for your time.