const & Object.freeze in ES

gistfile1.txt

$ babel-node
> const foo = []
'use strict'
> foo.push(1, 2, 3)
3
> foo
[ 1, 2, 3 ]
> Object.freeze(foo)
[ 1, 2, 3 ]
> foo.push(4, 5, 6)
repl:3
foo.push(4, 5, 6);
    ^
TypeError: Can't add property 3, object is not extensible
    at repl:3:5
    at Object.exports.runInThisContext (vm.js:54:17)
    at _eval (/usr/local/lib/node_modules/babel/lib/_babel-node.js:86:26)
    at REPLServer.replEval (/usr/local/lib/node_modules/babel/lib/_babel-node.js:169:14)
    at bound (domain.js:287:14)
    at REPLServer.runBound [as eval] (domain.js:300:12)
    at REPLServer.<anonymous> (repl.js:417:12)
    at emitOne (events.js:77:13)
    at REPLServer.emit (events.js:169:7)
    at REPLServer.Interface._onLine (readline.js:210:10)
>