Problem upgrading from buster to bullseye

The following packages have unmet dependencies:
 libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6+rpi1 is to be installed

But this is indeed a known error. Same happened in several other cases:

So worth it if it prevents users from some upgrade trouble. It is definitely a Buster package, and development headers, so safe to purge.