[whatwg/webidl] setter syntax should probably be restricted to always return undefined (Issue #1516)

emilio created an issue (whatwg/webidl#1516)

### What is the issue with the Web IDL Standard?

See https://github.com/w3c/css-houdini-drafts/issues/1142 for an example where return values are used, but probably shouldn't be.

I don't think there's any reasonable behavior if you were to specify a setter to return anything that wasn't the right hand side of the input. Right now implementations all ignore the return value.

Is there any reason something other than `undefined` is allowed in a `setter` operation?

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