classof.js
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classof.js
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	var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');
	var isCallable = require('../internals/is-callable');
	var classofRaw = require('../internals/classof-raw');
	var wellKnownSymbol = require('../internals/well-known-symbol');

	var TO_STRING_TAG = wellKnownSymbol('toStringTag');
	// ES3 wrong here
	var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';

	// fallback for IE11 Script Access Denied error
	var tryGet = function (it, key) {
	try {
	return it[key];
	} catch (error) { /* empty */ }
	};

	// getting tag from ES6+ `Object.prototype.toString`
	module.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {
	var O, tag, result;
	return it === undefined ? 'Undefined' : it === null ? 'Null'
	// @@toStringTag case
	: typeof (tag = tryGet(O = Object(it), TO_STRING_TAG)) == 'string' ? tag
	// builtinTag case
	: CORRECT_ARGUMENTS ? classofRaw(O)
	// ES3 arguments fallback
	: (result = classofRaw(O)) == 'Object' && isCallable(O.callee) ? 'Arguments' : result;
	};