3.0b3 - label[for] & input[id] discrepancies

i'm a little confused about how labels & inputs are assigned for/id pairs in FormHelper.

Here's the code i have (it's inside a foreach of an entity collection):

$attrId = 'Listing.ItemAttr.' . $attr->id;
echo
  $this->Html->div('columns small-16 medium-8',
    $this->Form->label($attrId, // [for] attribute
      $this->Form->checkbox(
        $attrId, // [name] attribute
        [
           'id' => $attrId, // [id] attribute - if i skip this for checkbox inputs, i don't get an [id] attribute.
           // 'label' => $attr->name >> turns into <input type="checkbox" label="Attribute Name">
           // other checkbox attributes
        ]
      ) . $attr->name,
      [
         'escape' => FALSE
      ]
    ) // end label
);

The resulting HTML:

<div class="columns small-16 medium-8">
  <label for="listing-itemattr-3">
    <input type="checkbox" id="Listing.ItemAttr.3" name="Listing[ItemAttr][3]">Attribute Name
  </label>
</div>

The label passes the [for] attribute through FormHelper::_domId, which i'd expect. But the [id] attribute doesn't appear to get the same treatment. i changed the checkbox() call to input() and the same ID string was assigned. It looks like an auto-generated ID is passed through _domId, but that only gets into the attributes if 'id' isn't already set in that array.

i also discovered that in the checkbox() method, a 'label' key is turned into an attribute of the input, not used to generate a wrapping <label> element as with most other inputs. Peculiar. So i'm doing this manual structure (which is fine, i also need to customize some other parts of the HTML anyway).

Question 1: In FormHelper::input(), shouldn't the ID attribute be adjusted with _domId after the $options array is complete? Or is there an issue in checkbox() that it's not outputting the generated ID to HTML?

Question 2: Any suggestions how to get the wrapping label's [for] to match the checkbox's [id] until one of the above is addressed?

Thanks.
-joe t.

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