[whatwg/webidl] Purpose of call-a-user-object’s-operation’s opName parameter (Issue #1282)

Callback interfaces are required to have one-and-only-one regular operation\*, which has a particular name. However [call a user object’s operation](https://webidl.spec.whatwg.org/#call-a-user-objects-operation) requires an `opName` parameter. This permits the algorithm to be invoked with a different name than the operation name that was given in the callback interface type that `value` is an instance of.

The only usages of the algorithm I could find are in the DOM spec, which always passes an `opName` that does align with the name of the CBI’s operation member. Is there any reason for this parameter to exist given it’s a static part of the type definition? It seems likely that it’s unintentional that it permits passing a different name.

_\* Which isn’t really an operation in the same sense that word is used elsewhere in the spec; it just uses the same syntax._

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