// TODO: use a separate cache for non-synthetic methods only
sbool callableOn_nonSynthetic(O o, S method, O... args) {
  Method m = findMethod_precise_onTypes(o, method, getClasses_array(args));
  ifdef callableOn_nonSynthetic_debug
    print("callableOn_nonSynthetic: m=" + m + ", synthetic: " + !isNonSynthetic(m));
  endifdef
  ret isNonSynthetic(m);
}