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CommonJS: Module instances of global objects share prototypes?
var myString1 = require('commonjs_mod').myString;
var myString2 = "app";
myString1.foo(); // no Fail. This string is an instance of a String whose prototype has a `foo` method
myString2.foo(); // Fail. This string is an instance of the global String native
String.prototype.foo = function(){ return "foo'd"; };
exports.myString = "mod";
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