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bramus I think in this case "the property" is the property being set, not the property that is IACVT. So, if we're setting another variable with universal/default syntax, use "guaranteed invalid" – but if we're setting a normal property, we still get "unset".
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bramus I think of 'initial' (a keyword to be replaced) as distinct from 'guaranteed invalid' (the initial value of most custom props). When a var is IACTV, we do want to set that GI value, but we don't want to pass along the 'initial' keyword. Then normal props treat GI as 'unset'.