setup-php/node_modules/object-keys/isArguments.js

'use strict';

var toStr = Object.prototype.toString;

module.exports = function isArguments(value) {
	var str = toStr.call(value);
	var isArgs = str === '[object Arguments]';
	if (!isArgs) {
		isArgs = str !== '[object Array]' &&
			value !== null &&
			typeof value === 'object' &&
			typeof value.length === 'number' &&
			value.length >= 0 &&
			toStr.call(value.callee) === '[object Function]';
	}
	return isArgs;
};