Allow TextDecoder to be used as a base class to extend from within application javascript #122
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JakeChampion
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This pull-request is part of the solution for #113
This pull-request changes our TextDecoder implementation to use JS_NewObjectForConstructor when the construction has come from the applications' JavaScript, which assigns the correct prototype to the instance being constructed (taking into account extends in JavaScript)
I've also added a test which confirms that the correct prototype has been assigned when extending from TextDecoder, the test is written in a way that makes it simpler to add the same test for any other builtin classes