fn set_length_from_value(
cx: &mut JSContext,
proxy: HandleObject<'_>,
backing_list: HandleObject<'_>,
value: HandleValue<'_>,
result: *mut ObjectOpResult,
) -> boolfn set_length_from_value(
cx: &mut JSContext,
proxy: HandleObject<'_>,
backing_list: HandleObject<'_>,
value: HandleValue<'_>,
result: *mut ObjectOpResult,
) -> bool