I am getting the same on a "text area" in a form using 1.1.3 and jQuery 1.7.2 and 1.8.3
It only happens once - when the app loads.
GET /__!!__
I see when I refresh the site
http://localhost/Cellar-CanJS-Bootstrapped/__!!__ 404 (Not Found)
What is generating the _!!_
I see it's line 3110 in canjquery.1.1.3.js - BUT - I don't know which attribute its not finding.
Could it be "wine" that is only used in winesList.ejs for the first time, but referred to in application.js
UPDATE:
it is EJS not finding the value
- <textarea id="description" name="description">__!!__</textarea>
- <textarea id="description" name="description"><%== wineDetails.attr('description');%></textarea>