fix jsvGetString regression
JsVar *jsvArrayBufferGet(JsVar *arrayBuffer, size_t idx) {
  JsvArrayBufferIterator it;
  jsvArrayBufferIteratorNew(&it, arrayBuffer, idx);
  JsVar *v = jsvArrayBufferIteratorGetValue(&it);
  jsvArrayBufferIteratorFree(&it);
  return v;
}

JsVar *jsvArrayBufferGet(JsVar *arrayBuffer, size_t idx) {
  JsvArrayBufferIterator it;
  jsvArrayBufferIteratorNew(&it, arrayBuffer, idx);
  JsVar *v = jsvArrayBufferIteratorGetValue(&it);
  jsvArrayBufferIteratorFree(&it);
  return v;
}
