[Webkit-unassigned] [Bug 203957] New: Getters on global are not invoked with global as this

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203957

            Bug ID: 203957
           Summary: Getters on global are not invoked with global as this
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: medikoo+webkit.org at medikoo.com

Test case:

```
window = this;

(function() { // based on https://mathiasbynens.be/notes/globalthis
  'use strict';
  Object.defineProperty(Object.prototype, '__magic__', {
    get: function() { return this; }
  });
  print('Is __magic__ a global', __magic__ === window);
  print('Is window.__magic__ a global', window.__magic__ === window);
}());
```

eshost-cli output:

$ eshost -s test.js
#### Chakra, SpiderMonkey, V8, V8 --harmony, XS
Is __magic__ a global true
Is window.__magic__ a global true

#### JavaScriptCore
Is __magic__ a global false
Is window.__magic__ a global true

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