Is it possible to use Handlebars with objects that have numeric keys?

For example:

var str = "<div>{{apples}}</div>",
    tmpl = Handlebars.compile(str);

tmpl({apples: "works!"}); // returns "<div>works!</div>"

Works great, but

var str = "<div>{{4}}</div>",
    tmpl = Handlebars.compile(str);

tmpl({4: "works!"}); 
// returns Error: Parse error on line 1: <div>{{4}}</div> -------^ Expecting 'DATA', 'ID', got 'INTEGER'

I was unable to find any references to this when searching, and I have not yet explored the source code.

javascript handlebars.js
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