I'm not convinced we need those extra comments as they could introduce confusion. Those options are set to false on purpose in development. The comment above `cache_classes` explains why. You wouldn't want to set them to true in development, so the comment about enabling them to make threadsafe should be removed. Also, in general, comments should be placed above code, not on the same line: https://github.com/bbatsov/ruby-style-guide#comments