use uint**_t for nan-boxing
use uint**_t for nan-boxing

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