Bug 254504

###### Version

safari 16.3 (18614.4.6.1.6)

###### Test case

```js
function foo() {
  var obj = {};
    var p0,p1
      switch (p0) {
        case (p0 = NaN):
        case p1:
          obj.prop = NaN;
          break;
      }
  return obj.prop
};
print(foo())
```

###### Execution steps

    .jsc Testcase.js

###### Output
```
undefined
```

###### Expected result
    NaN
     
###### Description

The correct output of the test case should be `NaN` while javascriptcore yields `undefined` . I think it might be an issue of javascriptcore.