toBigInt method
converts the field element to a big integer.
Implementation
BigInt toBigInt() {
List<int> buf = Bytes();
BigInt result = BigInt.zero;
for (int i = buf.length - 1; i >= 0; i--) {
// Shift the result left by 8 bits.
// OR the next byte into the result.
result = (result << 8) | BigInt.from(buf[i]);
}
return result;
}