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    Sub-task 
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    Resolution: Fixed
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     P4 P4
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    None
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    None
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        b98
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        generic
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        generic
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        Verified
jjs> ({,})
[object Object]
jjs> ({,a:0})
[object Object]
jjs> ({a:0,,})
[object Object]
All these should throw SyntaxError exceptions. Only trailing comma is permitted as per specification.