derived class shouldn't compare equal to base class

swig/edata.i

@@ -76,7 +76,7 @@ def __repr__(self):
     return _edata_repr(self)
 
 def __eq__(self, other):
-    return isinstance(other, self.__class__) and __eq__(self, other)
+    return other.__class__ == self.__class__ and __eq__(self, other)
 %}
 };
 %extend std::unique_ptr<amici::ExpData> {