[heycam/webidl] Should mixins be able to add overloads? (#261)

Consider this IDL:

    interface A {
      void foo();
    };

    [NoInterfaceObject]
    interface B {
      void foo(long arg);
    };

    A implements B;

Should this be allowed?  I _think_ the current spec more or less allows it, not least because it's pretty vague about when overload sets are actually determined.  But it's not entirely obvious to me whether this is desirable, because this makes the mixin change the behavior of existing methods on the interface, which is something that should really go in the base spec, not a mixin, I would think.

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https://github.com/heycam/webidl/issues/261