static O[] massageArgsForVarArgsCall(Executable m, O[] args) {

  Class<?>[] types = m.getParameterTypes();

  int n = types.length-1, nArgs = l(args);

  if (nArgs < n) null;

  for i to n:

    if (!argumentCompatibleWithType(args[i], types[i]))

      null;

  Class varArgType = types[n].getComponentType();

  for (int i = n; i < nArgs; i++)

    if (!argumentCompatibleWithType(args[i], varArgType))

      null;

  O[] newArgs = new O[n+1];

  arraycopy(args, 0, newArgs, 0, n);

  // TODO: optimize

  int nVarArgs = nArgs-n;

  O varArgs = Array.newInstance(varArgType, nVarArgs);

  for i to nVarArgs:

    Array.set(varArgs, i, args[n+i]);

  newArgs[n] = varArgs;

  ret newArgs;

}