DOMPoint dictionary problem

Making DOMPoint a dictionary, as currently proposed, is a problem since it
means other objects (such as the proposed DOMQuad) can't have DOMPoints as
attributes. I'm assuming the WebIDL restriction that attributes can't be
dictionaries is not easily removed.

I think we probably should make DOMPoint a regular interface. For methods
that take DOMPoints as parameters, we can retain the convenient literal
syntax for points by adding a DOMPointLiteral dictionary type and using
union types, e.g.
  DOMPoint convertPoint((DOMPoint or DOMPointLiteral) point);

Rob
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