Comment #8 on issue 1086 by mikesamuel: Can provided JSON object report
Object.proto.toString.call(JSON) == '[object JSON]'?
http://code.google.com/p/google-caja/issues/detail?id=1086
Does the test /\[native code\]/.test(window.JSON.parse.toString()) work for
you?
Slightly more efficient might be
Object.propertyIsEnumerable(window.JSON, 'parse');
since for ES3, native implementations do make parse noenum, and non-native
implementations can't, and in ES5, JSON is mandated.
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