Invokes a setter and returns a mirror on the result. The setter
may be either the implicit setter for a non-final field or a
user-defined setter method.
Returns true if this mirror is equal to other.
The equality holds if and only if
(1) other is a mirror of the same kind
and
(2) either
(a) hasReflectee is true and so is
identical(reflectee, oth...