Re: [heycam/webidl] No seemingly consistent Shepherd story (#240)

> but there's nothing that guarantees that will remain to be the case

There certainly is in implementations: the actual thing representing that record is typed as a map from DOMString to DOMString.

I thought that this was also the case for spec-land in the sense that adding something other than a DOMString->DOMString mapping to such a record was an invalid thing to do, just like adding a Document to a `sequence<Element>` is an invalid thing to do.  But it sounds like you're arguing that the latter is somehow OK too?

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