pack method
Implementation
@override
void pack(IsoComponent<Object> component, IsoBuffer buffer) {
final IsoBitSet bitSet = component.value! as IsoBitSet;
final int byteCount = length >= 8 ? bitSet.length + 62 >> 6 << 3 : length;
buffer.putBytes(IsoUtil.hexString(IsoUtil.bitSet2byte(bitSet, byteCount)).codeUnits);
}