Checklist

• tests and code linting passes
• a test and/or benchmark is included
• the commit message follows commit guidelines

Affected core subsystem(s)

util

Description of change

In certain conditions (see #6464), inspecting a Proxy object can lead to a max call stack error. Avoid that by detecting the Proxy object and outputting information about the Proxy object itself.

Also adds util.isProxy()

Fixes: #6464

/cc @bnoordhuis