encodeTo method
Convert self to a slice and append it to the destination.
Implementation
@override
void encodeTo(BigInt value, Output output) {
U128Codec.codec
..encodeTo(
(value & BigInt.parse('ffffffffffffffffffffffffffffffff', radix: 16))
.toUnsigned(128),
output)
..encodeTo((value >> 128).toUnsigned(128), output);
}