inherit-if-required.js
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inherit-if-required.js
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	var isCallable = require('../internals/is-callable');
	var isObject = require('../internals/is-object');
	var setPrototypeOf = require('../internals/object-set-prototype-of');

	// makes subclassing work correct for wrapped built-ins
	module.exports = function ($this, dummy, Wrapper) {
	var NewTarget, NewTargetPrototype;
	if (
	// it can work only with native `setPrototypeOf`
	setPrototypeOf &&
	// we haven't completely correct pre-ES6 way for getting `new.target`, so use this
	isCallable(NewTarget = dummy.constructor) &&
	NewTarget !== Wrapper &&
	isObject(NewTargetPrototype = NewTarget.prototype) &&
	NewTargetPrototype !== Wrapper.prototype
	) setPrototypeOf($this, NewTargetPrototype);
	return $this;
	};

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