simple checkbox

I am trying to get a simple single checkbox to work. I can't get the `value` to work. The two closest approaches are have found are *array/multipleCheckbox* and *string/checkbox*. However, neither is quite what I want. Here is the javascript:

```javascript
blue: fields.array({
choices: { one: 'item 1' },
widget: widgets.multipleCheckbox()
}),
green: fields.string({
value: 'abc',
widget: widgets.checkbox()
}),
```
and the resulting HTML:
```html

```
Using the *array/multipleCheckbox* I actually get the `` code I want. It has the correctly set `value`, but it is wrapped in an unwanted ``.

The other version using *string/checkbox* doesn't have the `` but the `value` incorrectly set to "on".