--- self[nth]

    nth ܤΥӥå(ǲ̥ӥå(LSB) 0 )ΩäƤ 1 
    򡢤Ǥʤ 0 ֤ޤ

    self[nth]=bit  Integer ˤʤΤϡNumeric Ϣ饹 
    immutable Ǥ뤿Ǥ

