I've been working with `Custom Elements` and I'm writing a lot of code against
tag attributes. In some cases, I want the attribute values to be unique on a
page (like `id`). It got me wondering about how the engines handle attribute
based searches, and if indexing (with unique/distinct options) would provide
value. I also find myself writing a lot of boilerplate getters/setters for
attributes in the elements. Attribute handling could be improved by adding some
additional support with something like an `attrib` feature. This would be
similar to `get` or `set` in use.
```
class MyElement extends HTMLElement{
attrib myAttrib('my-attribute') index distinct;
}
```
This would create the attribute `my-attribute` on the tag and element, and also
generate a getter and setter
```
get myAttrib() { return this.getAttribute('my-attribute'); }
set myAttrib(v) { this.setAttribute('my-attribute', v); }
```
The `index` flag it would tell the engine it should create a map/hash to
improve search optimization for heavily searched attributes.
The `distinct` flag would indicate that all values for that attribute within
context (e.g., document) should be unique. This might be used primarily by
IDE's to generate warnings.
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