Can't exclude folders using a separator #701

I'm trying to exclude some folders from being scanned for PHP, but I can only get it work for single folder names like vendor, if I only wanted a sub-folder excluded like vendor/google it doesn't work.

I'm using Windows, so I figured it might just be a slash escape problem, but nothing I've tried works /vendor/google, vendor\\google, /c/full/path/vendor/google, C:\\full\\path\\vendor\\google, C:/full/path/vendor/google, etc. Globs don't work either.

I know my paths aren't working because I keep seeing this error in the log:

codeintel-message: This buffer is configured with 873 PHP import dirs: this may result in poor completion performance:

Anyone have a working example?

I'm using the latest version off master with python3 and ST3 3208.