Rubocop is a linter, so it tends to have an easier time: it only needs to process input that is already correct, though it might have style issues. It doesn't n

Rubocop is a linter, so it tends to have an easier time: it only needs to process input that is already correct, though it might have style issues. It doesn't need to do anything that might change the meaning of your program. Inserting quotes will change the meaning of the program, so getting it right is much harder.