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CBOR: Concise Binary Object Representation

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# CBOR 0x(4+4)9 0x49
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“The Concise Binary Object Representation (CBOR)
is a data format whose design goals include the possibility of extremely small code size,
fairly small message size, and extensibility without the need for version negotiation.”

see [rfc8949](https://www.rfc-editor.org/rfc/rfc8949.html)

## Compatibility

The `core` mod should be fully compatible with rfc8949,
but some extensions will not be implemented in this crate,
such as `datetime`, `bignum`, `bigfloat`.

The `serde` mod defines how Rust types should be expressed in CBOR,
which is not any standard,
so different crate may have inconsistent behavior.

This library is intended to be compatible with `serde_cbor`,
but will not follow some unreasonable designs of `serde_cbor`.

* `cbor4ii` will express the unit type as an empty array instead of null.
  This avoids the problem that `serde_cbor` cannot distinguish between `None` and `Some(())`.
  see <https://github.com/pyfisch/cbor/issues/185>
* `cbor4ii` does not support packed mode, and it may be implemented in future,
  but it may not be compatible with `serde_cbor`.
  If you want packed mode, you should look at `bincode`.

## Performance

It is not specifically optimized for performance in implementation,
but benchmarks shows that its performance is slightly better than `serde_cbor`.

And it supports zero-copy deserialization and `deserialize_ignored_any` of serde,
so in some scenarios it may perform better than crate that do not support such feature.

## Robustness

The decode part has been fuzz tested,
and it should not crash or panic during the decoding process.

The decode of serde module has a depth limit
to prevent stack overflow or OOM caused by specially constructed input.
If you want to turn off deep inspection or adjust parameters,
you can implement the `dec::Read` trait yourself.

# License

This project is licensed under [the MIT license](LICENSE).

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