_KeyBinding kb = DefaultImplementation._keyGetBindingForKey(obj, "doubleObjectField");
assertEquals(Double.class, kb.valueType());
assertFalse(kb.isScalarProperty());
obj.doubleObjectField = FORTY_TWO_DOUBLE;
assertEquals(FORTY_TWO_DOUBLE, kb.valueInObject(obj));
kb = DefaultImplementation._keyGetBindingForKey(obj, "doubleField");
assertEquals(Double.class, kb.valueType());
assertTrue(kb.isScalarProperty());
obj.doubleField = FORTY_TWO_DOUBLE;