How can I find the user's "Favorite Songs" playlist?

It sounds simple but searching for the name "Favorite Songs" is a non-starter because it's called different names in different countries, even if I specify "&l=en_us" on the query.

So is there another property, relationship or combination thereof which I can use to tell me when I've found the right playlist?

Properties I've looked at so far:

  • canEdit: will always be false so narrows things down a little
  • inFavorites: not helpful as it depends on whether the user has favourite the favourites playlist, so not relevant
  • hasCatalog: seems always true so again may narrow things down a bit
  • isPublic: doesn't help

Adding the catalog relationship doesn't seem to show anything immediately useful either.

Can anyone help?

Ideally I'd like to see this as a "kind" or "type" as it has different properties to other playlists, but frankly I'll take anything at this point.

How can I find the user's "Favorite Songs" playlist?
 
 
Q