*   Add `tf.keras.layers.AbstractRNNCell` as the preferred implementation
        for RNN cells in TF v2. User can use it to implement RNN cells with
        custom behavior.
    *   Keras training and validation curves are shown on the same plot when
        using the TensorBoard callback.
    *   Switched Keras `fit/evaluate/predict` execution to use only a single
        unified path by default unless eager execution has been explicitly

* 🐛 Fix edge case with repeated aliases names not shown in OpenAPI. PR [#2351](https://github.com/tiangolo/fastapi/pull/2351) by [@klaa97](https://github.com/klaa97).