Restricts `isInstanceOf[Null]` checks#12905

Merged

smarter merged 2 commits intomasterfrom

Jun 23, 2021

Commits on Jun 22, 2021

Restricts `isInstanceOf[Null]` checks
Kordyjan
committed

Commits on Jun 23, 2021

Make `isInstanceOf[Null]` illegal everywhere
Kordyjan
committed