ordinary-to-primitive.js
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ordinary-to-primitive.js
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	var call = require('../internals/function-call');
	var isCallable = require('../internals/is-callable');
	var isObject = require('../internals/is-object');

	var $TypeError = TypeError;

	// `OrdinaryToPrimitive` abstract operation
	// https://tc39.es/ecma262/#sec-ordinarytoprimitive
	module.exports = function (input, pref) {
	var fn, val;
	if (pref === 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
	if (isCallable(fn = input.valueOf) && !isObject(val = call(fn, input))) return val;
	if (pref !== 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
	throw $TypeError("Can't convert object to primitive value");
	};

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