saves the arguments from the C-call according to the alien-fun-type of
the callback, and calls #'ENTER-ALIEN-CALLBACK with the index
-indentifying the callback, a pointer to the arguments copied on the
+identifying the callback, a pointer to the arguments copied on the
stack and a pointer to return value storage. When control returns to
the wrapper it returns the value to C. There is one assembler wrapper
per callback.[1] The SAP to the wrapper code vector is what is passed