Thanks for the feedback. We made sure that the product teams heard your perspective.

There is a button somewhere in the new rules editor for switching back to the old one. System wide, you can also disable the web application for the new rules editor. 

We expect that the old ZEN based rules editor will be deprecated eventually. However, there are plenty of enhancements to the new in the pipeline based on valuable feedback like this. 

When a language isn't strongly typed, I often test unexpected but possible types -- for example: Numbers or Strings instead of Dates or Booleans. 

Other favorites: 

  • ""
  • "null"
  • "undefined" 
  • Quotes, comments, and other injection attack patterns. 

As Jon Willeke suggested, I also use random data when possible (apart from the -1, 0, 1 defaults).  The %Library.PopulateUtils class can be helpful for generating other preformatted random information.