Calling self.valueOf() inside a web worker throws an error

Originator:fasttime.on
Number:rdar://21820506 Date Originated:14-Jul-2015 10:38 PM
Status:Open Resolved:
Product:Safari Product Version:8
Classification: Reproducible:
 
The JavaScript method self.valueOf() throws an error when called from a web worker in Safari 8, also indirectly e.g. in (self + ""). Older Safari versions don't seem affected by the problem.

For a trivial example, create file named "worker.js" containing a single line of code:

    self + "";

Then in an HTML file, start a web worker using the "worker.js" file above.

    <script>new Worker('worker.js');</script>

In Safari 8, in the debug console, you can see the error:

    TypeError: undefined is not an object

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