app = FastAPI()

@app.get("/items/invalidnone", response_model=Union[Item, None])
def get_invalid_none():
    return None
```

This way the data will be correctly validated, you won't have an internal server error, and the documentation will also reflect that this *path operation* could return `None` (or `null` in JSON).

### Fixes

    e.g., setting the environment variable `TF_ENABLE_MKL_NATIVE_FORMAT` will
    not have any effect.

*   TensorFlow has been validated on Windows Subsystem for Linux 2 (aka WSL 2)
    for both GPUs and CPUs.

*   Due to security issues (see section below), all boosted trees code has been
    deprecated. Users should switch to

hash.Write(label) lHash := hash.Sum(nil) firstByteIsZero := subtle.ConstantTimeByteEq(em[0], 0) seed := em[1 : hash.Size()+1] db := em[hash.Size()+1:] mgf1XOR(seed, mgfHash, db) mgf1XOR(db, mgfHash, seed) lHash2 := db[0:hash.Size()] // We have to validate the plaintext in constant time in order to avoid // attacks like: J. Manger. A Chosen Ciphertext Attack on RSA Optimal // Asymmetric Encryption Padding (OAEP) as Standardized in PKCS #1 // v2.0. In J. Kilian, editor, Advances in Cryptology. lHash2Good...