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IG-11 : You have suffered damage to your central processing unit.

The Mandalorian : You mean my brain.

IG-11 : That was a joke. It is meant to put you at ease.

Not sure how this is related

'Taika Waititi jokes about what writers should be asking for in the next round of talks with producers'

It is right there in the tweet.

And Taika was the voice of IG-11, in case that also wasn't clear.

and directed that episode.