Re: [whatwg/dom] Define processing instruction attributes (PR #1454)

noamr left a comment (whatwg/dom#1454)

> > It's easy enough to add if there is popular demand.
> 
> well ... it's a proxy on JS side that needs to be there due identity checks + it behaves like an Array but it's effectively more like an `arguments` reference so, in case it'll ever land (I hope no!) I'd be more than curious to see how easier/shaped that would be, so far so good though, less things to maintain/think about, thank you.

There are actually multiple examples of this in the web platform, it's effectively a [Map-like object](https://webidl.spec.whatwg.org/#idl-maplike)

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