custom data attribute on <iron-ajax> disappeard after render in template

[NanoWANG]

      <template is='dom-repeat' items='{{ resourcesList }}'>

        <iron-ajax auto data-resource-name='{{ item.name }}' handle-as='json' on-response='resourceLoaderResponse' url='{{item.fullPath}}'></iron-ajax>

      </template>

It looks fine right?

But in the actually shadow-root, it becomes:

<iron-ajax auto= handle-as="json"></iron-ajax>
<iron-ajax auto= handle-as="json"></iron-ajax>

<iron-ajax auto= handle-as="json"></iron-ajax>

...

Hence, I can't pass custom value between the data attribute.

I'm wondering if this is a bug.

Thx

NanoWANG

[NanoWANG]

I guess I just found out the answer, should use `$=` for attribute binding.