Unrecognized type "Function" in my idlharness tests

[domenic]

In #22982, I have the IDL

[Exposed=(Window,Worker,Worklet)]
interface CountQueuingStrategy {
  constructor(QueuingStrategyInit init);

  attribute unrestricted double highWaterMark;
  readonly attribute Function size;
};

but idlharness gives me

CountQueuingStrategy interface: new CountQueuingStrategy({ highWaterMark: 5 }) must inherit property "size" with the proper type	Unrecognized type Function

errors. Function is built in to Web IDL. How do I get idlharness to recognize it?

[stephenmcgruer]

Looks like this comes from IdlArray.prototype.assert_type_is - Function might not be in the big list of accepted types there. (I don't see it offhand). I can get to this sometime in the next week, or PRs welcome (though idlharness is quite intimidating, at least to me!)