Bug in SP.JS with SP.List.set_enableVersioning(bool)

Question

Currently their are two functions used for getting/setting major versioning for sharepoint lists in javascript. list.get_enableVersioning() and list.set_enableVersioning(). The get operation works fine, however the set will come back as successful with no
changes actually performed on the list.
The following is a code sample which shows the behavior :)
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js"></script>
<script>
$(document).ready(function()
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', function()
$('div#log').append("SharePoint Client Object Model Loaded<br/>");
var ctx;
function GetContext()
ScanWeb($("#scURL").val());
function ScanWeb(URL)
var wCtx;
var features;
var web;
var url;
var webs;
var guid;
var view;
var feature;
var list;
var views;
var viewFields;
url = URL;
//get SPWeb at specified URL
function scan()
$('div#log').append("Starting scan of " + URL + "<br/>");
wCtx = new SP.ClientContext(URL);
web = wCtx.get_web();
wCtx.load(web);
$('div#log').append("Loaded site at: " + URL + "<br/>");
CheckAndUpdateVersioning();
ScanForSubwebs();
function ScanForSubwebs()
$('div#log').append("Loading whether site contains subsites<br/>");
wCtx = new SP.ClientContext(URL);
webs = wCtx.get_web().get_webs();
wCtx.load(webs)
wCtx.executeQueryAsync(function(sender, args)
var wEnum = webs.getEnumerator();
while(wEnum.moveNext())
var w = wEnum.get_current();
$('div#log').append("Opened site " + w.get_url() + "<br/>");
ScanWeb(w.get_url());
}, Function.createDelegate(this, this.Error));
function CheckAndUpdateVersioning()
list = web.get_lists().getByTitle('Documents');
wCtx.load(list);
wCtx.executeQueryAsync(function(sender, args)
$('div#log').append(web.get_url() + " Library EnableVersioning is enabled: " + list.get_enableVersioning()+ "<br/>");
if(list.get_enableVersioning() == false)
EnableVersions();
}, Function.createDelegate(this, this.Error));
function EnableVersions()
list.set_enableVersioning(true)
list.update();
wCtx.executeQueryAsync(function(sender, args)
$('div#log').append("Versioning enabled: " + vr + "<br/>");
}, Function.createDelegate(this, this.Error));
function Error(sender, args)
$('div#log').append("<div style='color:red'>Error: " + URL + "<br/>" + args.get_message() + "<br/>" + args.get_stackTrace() + "<div>");
scan();
</script>
<div id="log">
<b>Progress:</b><br/>
</div>
<span>
Site Collection URL
<input id="scURL" type="text" />
<input id="activateBtn" type="button" value="Enable Versioning" onclick="GetContext();return false;"/>
</span>
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Answer 1

You probably need to load the list into the context after you set the property and call the update method. The code below is working for me:
function setListVersioning() {
hostweburl = decodeURIComponent(getQueryStringParameter('SPHostUrl'));
appweburl = decodeURIComponent(getQueryStringParameter('SPAppWebUrl'));
context = new SP.ClientContext.get_current();
hostWebContext = new SP.AppContextSite(context, hostweburl);
currentWeb = hostWebContext.get_web();
list = currentWeb.get_lists().getByTitle("Documents");
list.set_enableVersioning(true);
list.update();
context.load(list);
context.load(currentWeb);
context.executeQueryAsync(function () {
var success = list.get_enableVersioning();
}, failure(function(sender,e){
alert(e);
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