To expand, ! means it's a more dangerous version of the method without the ![0]. A method could be dangerous, but not have a safer counterpart, and thus be name

To expand, ! means it's a more dangerous version of the method without the ![0]. A method could be dangerous, but not have a safer counterpart, and thus be named without a !. [0] https://www.ruby-forum.com/topic/176830#773946 https://www.ruby-forum.com/topic/176830#773946