Demonstrate possible regression

Author: mweststrate

__tests__/base.js

@@ -941,7 +941,9 @@ function runBaseTest(name, autoFreeze, useStrictShallowCopy, useListener) {
 					if (canReferNonEnumerableProperty) s.foo.a++
 					if (useStrictShallowCopy) expect(isEnumerable(s, "foo")).toBeFalsy()
 				})
-				if (canReferNonEnumerableProperty) expect(nextState.foo).toBeTruthy()
+				if (canReferNonEnumerableProperty) {
+					expect(nextState.foo).toEqual({a: 2})
+				}
 				if (useStrictShallowCopy)
 					expect(isEnumerable(nextState, "foo")).toBeFalsy()
 				if (useStrictShallowCopy) expect(nextState.baz).toBeTruthy()