Why on earth would the language hinder you from iterating fast with a flag, and then convert all the warnings to errors when you run the full tests? There is a

Why on earth would the language hinder you from iterating fast with a flag, and then convert all the warnings to errors when you run the full tests? There is a cost to this too. It is another option. Another thing to document and maintain. Another thing for developers to learn about. Another thing for newbies to be confused by. Another thing that will asked about on the mailing list.