Differentiating interruptible and uninterruptible spells on castbar?

[Eungavi]

So, I've always been curious on how others would differentiate interruptible and uninterruptible spells on castbar.

Until now, I haven't done anything to differentiate them (cause I'm super lazy ), but I started to feel that I'm wasting so much int'ing spells on those uninterruptible spells

How's everyone managing those?

Text? Color? or Texture?