Great article with a lot of valuable information! 🎉

 

I personally find the global rule set a bit challenging, as it also marks something like "new AgentScheduleUtil();" or "Object.extendsObject(AbstractAjaxProcessor, {" as errors which may lead to confusion among developers. Your current list is also missing GlideRecordSecure and GlideAggregate. 

 

"Strangely, the complete configuration is nevertheless stored in the database without being truncated. "

Once you go past 255 as the max length, the only limit is what the database can store in a single field:

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0685779