code: function bignumToString(bignum, base, alphabet) {
          // Prefer native conversion
          if (alphabet === "native" && base != 6) {
              return bignum.toString(base);
          }
  
          // Old-sk00l conversion
          var result = [];
  
          while (bignum.gt(0)) {
              var ord = bignum.mod(base);
              result.push(alphabet.charAt(ord));
              bignum = bignum.div(base);
          }
  
          return result.reverse().join("");
      }
docs: Convert the bignum to a string with the given base