Are Übers and Key Wardens considered elite monsters?

Question

According to diablowiki:

There are three types of elite monsters in Diablo III.
Superunique
[...] All quest monsters, including Diablo, are considered superunique. 
Rare
[...]
Champion
[...]

If I'm understanding this correctly it means bosses are affected by the "extra damage to elites"//"less damage from elites" affix some items have.

Are the Übers and Key Wardens, despite not being regular quest monsters, also elites and, thus affected by these affixes?

Answer 1

Yes, they are affected by these affixes. You can test that by getting a Witch Doctor with Gargantuan / Restless Giant.