Query.has and Query.hasNot seem to query children as well

I'm running into an issue where the following test case is failing when, based on the documentation for the `has` and `hasNot` functions, it should be passing. The following is the test case itself and after is the relevant console log.

```
table
|> Query.fromHtml
|> Query.find [ Selector.tag "thead" ]
|> Query.find [ Selector.tag "tr" ]
|> Query.hasNot [ Selector.attribute (Aria.colIndex 1) ]
```

```
> Table
> colindex on tr
> is not added for a non contiguous heading list

▼ Query.fromHtml

label


label

label

▼ Query.find [ tag "thead" ]

1)


label


label


label

▼ Query.find [ tag "tr" ]

1)

label


label


label

▼ Query.hasNot [ attribute "aria-colindex" "1" ]

> has not attribute "aria-colindex" "1"
```

My thought is that this would pass because the `tr` tag does not have a `aria-colindex` attribute. This is a similar case shown in the documentation for the package, but is not executing as expected. After playing with it a bit I figure out that it was due to the fact that there was a child `th` element that did have a `aria-colindex="1"` which makes the test fail. The only way I've been able to get around this issue is to modify the table's structure to not include the child `th` tags, but this is not ideal.

I'm kind of asking 2 questions here which is
1. Is this functionality expected?
2. If it is, than how would you recommend testing for an attribute to not be on an element?