[TxMt] (TM2) Excluding directories from searches with "excludeDirectories"?

[Tyson Tate]

In TextMate 2 I'd like to exclude the contents of a number of folders from my project-wide searches. I'm using the following in my project's ".tm_properties" file:

    excludeDirectories = "{$excludeDirectories,log,vendor,tmp}"

However, it doesn't seem to be excluding files from those directories in my project-wide searches. What am I missing?

-Tyson