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LibWeb: Allow passing null to a nullable IDL union type
This fixes an issue on Twitter where they were instantiating an IntersectionObserver with a null root. The root IDL type is `(Element or Document)?` so null needs to be allowed.
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@ -1334,7 +1334,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
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if (!optional_default_value.has_value() || optional_default_value == "null"sv) {
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union_generator.append(R"~~~(
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Optional<@union_type@> @cpp_name@;
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if (!@js_name@@js_suffix@.is_undefined())
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if (!@js_name@@js_suffix@.is_nullish())
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@cpp_name@ = TRY(@js_name@@js_suffix@_to_variant(@js_name@@js_suffix@));
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)~~~");
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} else {
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