As a user of Common Lisp that is lately learning Ruby, i am amazed at how weak the type system is and how many stuff that would immediately cause a compiler err

As a user of Common Lisp that is lately learning Ruby, i am amazed at how weak the type system is and how many stuff that would immediately cause a compiler error in Lisp (like asking values from class members that don't exist) simply pass silently with no error (not even at runtime) in Ruby. Since every call is a method, and a method belongs to an object, the type of this object is significant. Base Ruby language gives you no way to declare that object X shall be of class C. So, well, there are dynamic languages and there are dynamic languages.