radix = Integer.parseInt(m.group(6));
if(n == null)
return null;
BigInteger bn = new BigInteger(n, radix);
if(negate)
bn = bn.negate();
if(m.group(8) != null)
return BigInt.fromBigInteger(bn);
return bn.bitLength() < 64 ?
Numbers.num(bn.longValue())
: BigInt.fromBigInteger(bn);