See section 15.5.5.1"It (String object) has the attributes { [[Writable]]: false, [[Enumerable]]:
false, [[Configurable]]: false }."
and see section 11.4.1
"In addition, if a delete operator occurs within strict mode code and the
property to be deleted has the attribute { [[Configurable]]: false }, a
TypeError exception is thrown."
This case is tested in the new test.
https://codereview.chromium.org/11094021/
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