static Method fastIntern_method;

static S fastIntern(S s) ctex {
  if (s == null) null;
  if (fastIntern_method == null) {
    fastIntern_method = findMethodNamed(javax(), 'internPerProgram);
    if (fastIntern_method == null) upgradeJavaXAndRestart();
  }
    
  ret (S) fastIntern_method.invoke(null, s);
}