Re: How to specify an object that can be mutable or immutable

Immutability and read-only are different. An immutable object is one that
is guaranteed to not change. In your case, a DOMRectReadOnly can change ---
if it's actually a DOMRect. You just can't change it through the
DOMRectReadOnly interface.

This would be more clear if we called it DOMRectImmutable; it would be odd
to have DOMRect extend DOMRectImmutable, because a DOMRect isn't immutable.

Rob
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