Crash with checks on large protocol buffers

I just updated to the latest version of assert and it seems to be causing havoc on our CI/CD system. The problem is that we have several checks on large protocol buffers. The private `state` member is then rendered through the repr reflection system and it can be hundreds of thousands (millions?) of lines.

- Did the default behavior of printing private members change recently?
- Is there some way that I can globally disable showing private members in the assert library without having to pass extra arguments to every assert call?