Re: [fetch] OpenEndedDictionary clarification (#164)

>From reading the referenced w3c issue, it appears that `OpenEndedDictionary` also refers to a coercion from iterable (and possibly other?) types.

Unfortunately it seems the issue arrives to the discussion quite late- is there any other background we can refer to for this?  I understand the semantics are really not yet pinned down and we will wait until everything is ratified for a 'final' implementation, but it may be less cognitive overhead our end if we can understand the root motivation for this new IDL definition.

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