// TODO: use a separate cache for non-synthetic methods only
sbool callableOn_nonSynthetic(O o, S methodName, O... args) {
  L<Method> l = findMethods_precise_onTypes(o, methodName, getClasses_array(args));
  if (l != null)
    for (Method m : l)
      if (isNonSynthetic(m))
        true;
  false;
}