Geb .closest() method doesn't support CSS attribute selectors

[BillyRayPreachersSon]

Given the following markup:

<div someAttr="foo">
    <div someAttr="bar">
        <h1>A title</h1>
    </div>
</div>

Given the following content, I would expect "fooEl" to find me the first div element :

title { $('h1') }
fooEl { title.closest('[someAttr="foo"]') }

However, it returns nothing. Changing the attribute selector into a map does work, so the element is definitely present.

[BillyRayPreachersSon]

It also fails when attempting to select child elements using CSS attribute selectors via the .children() method.