O **FastAPI** é baseado nesses type hints, eles oferecem muitas vantagens e benefícios.

Mas mesmo que você nunca use o **FastAPI**, você se beneficiaria de aprender um pouco sobre eles.

/// note | Nota

Se você é um especialista em Python e já sabe tudo sobre type hints, pule para o próximo capítulo.

///

## Motivação

Vamos começar com um exemplo simples:

	DeleteMarker              bool                   // represents DeleteMarker replication state
	ReplicationTimeStamp      time.Time              // timestamp when last replication activity happened
	ReplicationStatusInternal string                 // stringified representation of all replication activity
	// VersionPurgeStatusInternal is internally in the format "arn1=PENDING;arn2=COMPLETED;"

    computationComplete.await();

    // At this point, the listener should be holding the seed value (a -> a), and the map should
    // contain the computed value (b -> b), since the clear() happened before the computation
    // completed.
    assertEquals(1, listener.size());
    RemovalNotification<String, String> notification = listener.remove();
    assertEquals("a", notification.getKey());

    computationComplete.await();

    // At this point, the listener should be holding the seed value (a -> a), and the map should
    // contain the computed value (b -> b), since the clear() happened before the computation
    // completed.
    assertEquals(1, listener.size());
    RemovalNotification<String, String> notification = listener.remove();
    assertEquals("a", notification.getKey());

 * provide much stronger guarantees.
 *
 * <h3>Comparison to a map of collections</h3>
 *
 * <p>Multimaps are commonly used in places where a {@code Map<K, Collection<V>>} would otherwise
 * have appeared. The differences include:
 *
 * <ul>
 *   <li>There is no need to populate an empty collection before adding an entry with {@link #put
 *       put}.

   * in Waiter.
   */

  /**
   * This field encodes the current state of the future.
   *
   * <p>The valid values are:
   *
   * <ul>
   *   <li>{@code null} initial state, nothing has happened.
   *   <li>{@link Cancellation} terminal state, {@code cancel} was called.
   *   <li>{@link Failure} terminal state, {@code setException} was called.

	}
	inputSerialized := make([]metaCacheEntry, len(inputs))
	for i, xl := range inputs {
		xl.sortByModTime()
		var err error
		entry := metaCacheEntry{
			name: "testobject",
		}
		entry.metadata, err = xl.AppendTo(nil)
		if err != nil {
			t.Fatal(err)
		}
		inputSerialized[i] = entry
	}

	tests := []struct {
		name         string
		m            metaCacheEntries
		r            metadataResolutionParams

  j. Sui Generis Database Rights means rights other than copyright
     resulting from Directive 96/9/EC of the European Parliament and of
     the Council of 11 March 1996 on the legal protection of databases,
     as amended and/or succeeded, as well as other essentially
     equivalent rights anywhere in the world.

  k. You means the individual or entity exercising the Licensed Rights

Validaciones específicas para strings:

* `min_length`
* `max_length`
* `pattern`

En estos ejemplos viste cómo declarar validaciones para valores de tipo `str`.

* Then **comment** saying that you did that, that's how I will know you really checked it.

/// info

Unfortunately, I can't simply trust PRs that just have several approvals.

Several times it has happened that there are PRs with 3, 5 or more approvals, probably because the description is appealing, but when I check the PRs, they are actually broken, have a bug, or don't solve the problem they claim to solve. 😅