Is your observation based on files that are downloaded from the iTunes Store? I did some tests and it seems that iTunes treats everything as "Explicit" except 0 (which is no rating) and 2 (which is rated as "Clean").
Is your observation based on files that are downloaded from the iTunes Store? I did some tests and it seems that iTunes treats everything as "Explicit" except 0 (which is no rating) and 2 (which is rated as "Clean").