FileType: MacType and MacCreator

MacType and MacCreator still exists in the Language Reference and in the IDE.

I was thinking these were deprecated in OS X (Yosemite 10.10.5… running). This is confirmed each time I poll the Finder for MacType and MacCreator (using AppleScript).

Now, I want to know what MUST I place in the IDE, in the File Type Editor MacType and MacCreator fields.

a. “???”
b. " "
c. “”

Ideas ?

BTW: I will not add a bug feature for my usual reasons and… because they have so many things to do in their plate…

Think:
Select the third defined File Type (in the set) and press the Return Key. Guess which line will be selected ?
(answer: the first line !)