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LibJS: Fix fraction substring in parse_time_zone_offset_string()
We're supposed to get the substring from `fraction`, which is guaranteed to have the required length. `fraction_part` is the user-supplied value and trying to get a substring view from 0-9 might crash.
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@ -285,7 +285,7 @@ ThrowCompletionOr<double> parse_time_zone_offset_string(GlobalObject& global_obj
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auto fraction = String::formatted("{}000000000", *fraction_part);
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// b. Let nanoseconds be the String value equal to the substring of fraction consisting of the code units with indices 0 (inclusive) through 9 (exclusive).
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// c. Set nanoseconds to ! ToIntegerOrInfinity(nanoseconds).
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nanoseconds = MUST(Value(js_string(vm, fraction_part->substring_view(0, 9))).to_integer_or_infinity(global_object));
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nanoseconds = MUST(Value(js_string(vm, fraction.substring_view(0, 9))).to_integer_or_infinity(global_object));
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}
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// 11. Else,
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else {
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