NO_INLINE JsVar *__jspePostfixExpression(JsVar *a) {
  while (lex->tk==LEX_PLUSPLUS || lex->tk==LEX_MINUSMINUS) {
    int op = lex->tk;
    JSP_ASSERT_MATCH(op);
    if (JSP_SHOULD_EXECUTE) {
      JsVar *one = jsvNewFromInteger(1);
      JsVar *oldValue = jsvAsNumberAndUnLock(jsvSkipName(a)); // keep the old value (but convert to number)
      JsVar *res = jsvMathsOpSkipNames(oldValue, one, op==LEX_PLUSPLUS ? '+' : '-');
      jsvUnLock(one);

      // in-place add/subtract
      jsvReplaceWith(a, res);
      jsvUnLock(res);
      // but then use the old value
      jsvUnLock(a);
      a = oldValue;
    }
  }
  return a;
}
NO_INLINE JsVar *__jspePostfixExpression(JsVar *a) {
  while (lex->tk==LEX_PLUSPLUS || lex->tk==LEX_MINUSMINUS) {
    int op = lex->tk;
    JSP_ASSERT_MATCH(op);
    if (JSP_SHOULD_EXECUTE) {
      JsVar *one = jsvNewFromInteger(1);
      JsVar *oldValue = jsvAsNumberAndUnLock(jsvSkipName(a));  
      JsVar *res = jsvMathsOpSkipNames(oldValue, one, op==LEX_PLUSPLUS ? '+' : '-');
      jsvUnLock(one);

       
      jsvReplaceWith(a, res);
      jsvUnLock(res);
       
      jsvUnLock(a);
      a = oldValue;
    }
  }
  return a;
}