Disable helper instance variables

Look, if you're the kind of person to use Rails helpers, you should know that with Great Globals comes Great Responsibility to know what you're doing with respect to mucking with state. There are countless reasons you might want to memoize an expensive operation in a helper for the life of a request so that you can repeatedly invoke a helper without paying that cost N times

config/base.yml

@@ -185,7 +185,7 @@ Rails/HasManyOrHasOneDependent:
   Enabled: false
 
 Rails/HelperInstanceVariable:
-  Enabled: true
+  Enabled: false
 
 Rails/HttpPositionalArguments:
   Enabled: true