POLICY_INFO_PRIMARY_DOMAIN = 3,
		POLICY_INFO_ACCOUNT_DOMAIN = 5,
		POLICY_INFO_SERVER_ROLE    = 6,
		POLICY_INFO_MODIFICATION   = 9,
		POLICY_INFO_DNS_DOMAIN     = 12
	};

	typedef [switch_type(short)] union {
		[case(POLICY_INFO_ACCOUNT_DOMAIN)] LsarDomainInfo account_domain;
		[case(POLICY_INFO_DNS_DOMAIN)] LsarDnsDomainInfo dns_domain;
	} LsarPolicyInfo;

	typedef struct {
		sid_t *sid;
	} LsarSidPtr;

		POLICY_INFO_PRIMARY_DOMAIN = 3,
		POLICY_INFO_ACCOUNT_DOMAIN = 5,
		POLICY_INFO_SERVER_ROLE    = 6,
		POLICY_INFO_MODIFICATION   = 9,
		POLICY_INFO_DNS_DOMAIN     = 12
	};

	typedef [switch_type(short)] union {
		[case(POLICY_INFO_ACCOUNT_DOMAIN)] LsarDomainInfo account_domain;
		[case(POLICY_INFO_DNS_DOMAIN)] LsarDnsDomainInfo dns_domain;
	} LsarPolicyInfo;

	typedef struct {
		sid_t *sid;
	} LsarSidPtr;

/// note | "Hinweis"

FastAPI weiß, dass der Wert von `q` nicht erforderlich ist, wegen des definierten Defaultwertes `= None`

Das `Union` in `Union[str, None]` wird von FastAPI nicht verwendet, aber es erlaubt Ihrem Editor, Sie besser zu unterstützen und Fehler zu erkennen.

///

## Ohne Pydantic

Das gleiche wird passieren, wenn Sie eine <abbr title='Eine Union mehrerer Typen bedeutet: „Irgendeiner dieser Typen“'>Union</abbr> mehrerer Typen haben, und einer oder mehrere sind nicht gültige Pydantic-Typen. Zum Beispiel funktioniert folgendes nicht 💥:

//// tab | Python 3.10+

```Python hl_lines="8"

The same would happen if you had something like a <abbr title='A union between multiple types means "any of these types".'>union</abbr> between different types where one or more of them are not valid Pydantic types, for example this would fail 💥:

//// tab | Python 3.10+

```Python hl_lines="8"

    return result;
  }

  /**
   * Returns a new range set consisting of the union of this range set and {@code other}.
   *
   * <p>This is essentially the same as {@code TreeRangeSet.create(this).addAll(other)} except it
   * returns an {@code ImmutableRangeSet}.
   *
   * @since 21.0
   */
  public ImmutableRangeSet<C> union(RangeSet<C> other) {
    return unionOf(Iterables.concat(asRanges(), other.asRanges()));
  }

        }


        @Override
        public void decode_out ( NdrBuffer _src ) throws NdrException {
            this.level = _src.dec_ndr_long();
            _src.dec_ndr_long(); /* union discriminant */
            int _infop = _src.dec_ndr_long();
            if ( _infop != 0 ) {
                if ( this.info == null ) { /* YOYOYO */
                    this.info = new ShareInfoCtr0();
                }

/// note

FastAPI will know that the value of `q` is not required because of the default value `= None`.

The `str | None` (Python 3.10+) or `Union` in `Union[str, None]` (Python 3.8+) is not used by FastAPI to determine that the value is not required, it will know it's not required because it has a default value of `= None`.

* 🚥 🔢 **⭐ 🆎** (💖 `int`, `float`, `str`, `bool`, ♒️) ⚫️ 🔜 🔬 **🔢** 🔢.
* 🚥 🔢 📣 🆎 **Pydantic 🏷**, ⚫️ 🔜 🔬 📨 **💪**.

/// note

FastAPI 🔜 💭 👈 💲 `q` 🚫 ✔ ↩️ 🔢 💲 `= None`.

 `Union` `Union[str, None]` 🚫 ⚙️ FastAPI, ✋️ 🔜 ✔ 👆 👨‍🎨 🤝 👆 👍 🐕‍🦺 & 🔍 ❌.

///

## 🍵 Pydantic

In general, ASGI middlewares are classes that expect to receive an ASGI app as the first argument.

So, in the documentation for third-party ASGI middlewares they will probably tell you to do something like:

```Python
from unicorn import UnicornMiddleware

app = SomeASGIApp()

new_app = UnicornMiddleware(app, some_config="rainbow")
```