[chris12321]

I didn't mean to imply you didn't know that stuff, I just tend to write comments from the basics for anyone unfamiliar who may be reading. Yup I would expect it to have an (extremely small) boot time impact. Though I don't think it would have a runtime impact, since surely ruby has to check the frozen flag on mutation whether the flag has been set to true or not? Also by including the gem you preclude mutating the class objects anyway, since it raises an error.