to-primitive.js
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	var call = require('../internals/function-call');
	var isObject = require('../internals/is-object');
	var isSymbol = require('../internals/is-symbol');
	var getMethod = require('../internals/get-method');
	var ordinaryToPrimitive = require('../internals/ordinary-to-primitive');
	var wellKnownSymbol = require('../internals/well-known-symbol');

	var $TypeError = TypeError;
	var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');

	// `ToPrimitive` abstract operation
	// https://tc39.es/ecma262/#sec-toprimitive
	module.exports = function (input, pref) {
	if (!isObject(input) \|\| isSymbol(input)) return input;
	var exoticToPrim = getMethod(input, TO_PRIMITIVE);
	var result;
	if (exoticToPrim) {
	if (pref === undefined) pref = 'default';
	result = call(exoticToPrim, input, pref);
	if (!isObject(result) \|\| isSymbol(result)) return result;
	throw $TypeError("Can't convert object to primitive value");
	}
	if (pref === undefined) pref = 'number';
	return ordinaryToPrimitive(input, pref);
	};