remove type check guards in compare function
remove type check guards in compare function

leavesbnw/picrin,dcurrie/picrin,ktakashi/picrin,leavesbnw/picrin,omasanori/picrin,koba-e964/picrin,ktakashi/picrin,picrin-scheme/picrin,picrin-scheme/picrin,omasanori/picrin,leavesbnw/picrin,koba-e964/picrin,koba-e964/picrin,ktakashi/picrin,dcurrie/picrin