* Change isReferenced to return false for object/class method parameter names.
* use indexOf instead of for-of loop
* replace `.indexOf` check with `.includes` and assume `parent.params` exists
Co-Authored-By: Justin Ridgewell <justin@ridgewell.name>
* check .params within case block for ClassMethod/ClassPrivateMethod/ObjectMethod only
* add comment clarifying that case clause fall-through is intentional
Co-authored-by: Justin Ridgewell <justin@ridgewell.name>