lib/bigint.js
function copyInt_(x,n) {
    var i,c;
    for (c=n,i=0;i<x.length;i++) {
      x[i]=c & mask;
      c>>=bpe;
    }
  }
function copyInt_(x,n) {
    var i,c;
    for (c=n,i=0;i<x.length;i++) {
      x[i]=c & mask;
      c>>=bpe;
    }
  }
function copyInt_ ( x , n ) { var i , c ; for ( c = n , i = 0 ; i < x . length ; i ++ ) { x [ i ] = c & mask ; c >>= bpe ; } }
do x=y on bigInt x and integer y.
do x = y on bigInt x and integer y .