Comment by randomswede

I mean, to some respect, "dynamic typing" is "type the data" and "static typing" is "type the variable".

In both cases, there's the possibility for doing type propagation. But, if you somehow manage to pass in two floats to an addition that a C compiler thinks is an integer addition, you WILL have a bad day. Whereas in Common Lisp, the actual passed-in values are typed (for floats, usually boxed, for integers, if they're fixnums, usually tagged and having a few bits less than you would expect).