Handle assignment of the interceptor value identified by |index|. |object|
is the receiver ('this' object) of the interceptor. |value| is the new
value being assigned to the interceptor. If assignment fails, set
|exception| to the exception that will be thrown. Return true (1) if
interceptor assignment was handled, false (0) otherwise.
Handle assignment of the interceptor value identified by |index|. |object| is the receiver ('this' object) of the interceptor. |value| is the new value being assigned to the interceptor. If assignment fails, set |exception| to the exception that will be thrown. Return true (1) if interceptor assignment was handled, false (0) otherwise.