Where does TextMate store its bundles anyway?

After spending nearly an hour tracking down where a particular TextMate bundle was coming from, I have surmised that there are no less than four places on my Mac’s hard drive where bundles may be lurking. In no particular order, they are:

~/Library/Application Support/TextMate/Pristine Copy/Bundles
~/Library/Application Support/TextMate/Bundles
/Library/Application Support/TextMate/Bundles