the raw parameter types of this object, e.g.
for a method
void someMethod(String first, int second) {..}
this would be the JavaClasses equivalent to [String.class, int.class],
for a method
<T> void someMethod(T generic) {..}
this would be the erasure of the generic type variable T,
i.e. the JavaClass equivalent to Object.class.
Note that for non-generic cases this returns the same as getParameterTypes().