Tag Along and Duration Extender

[zabladius]

I was working on Rem builds today and noticed that the regeneration time for Tag Along doesn't seem to increase when you buy Superior Duration (or any other duration time buffs.) Is this intentional, or a bug?

 

[MrMassacre]

As far as I know, this is the only buff duration that isn't extended by duration items. Some healing items also don't get affected by duration, but they provide a total healing amount across a set duration, not a regen per second. Mystic Regeneration also applies a regen per second buff and DOES get extended by duration items, so I'm not sure why it's different for REM if it's intentional.