cbor_get_uint64
res = cbor_build_uint64(cbor_get_uint64(item));
return cbor_get_uint64(item);
_CBOR_NODISCARD CBOR_EXPORT uint64_t cbor_get_uint64(const cbor_item_t *item);
return cbor_encode_uint64(cbor_get_uint64(item), buffer, buffer_size);
return cbor_encode_negint64(cbor_get_uint64(item), buffer, buffer_size);