// Remove STANDARD StorageClass
	metadata = removeStandardStorageClass(metadata)
	// Clean meta etag keys 'md5Sum', 'etag', "expires", "x-amz-tagging".
	return cleanMetadataKeys(metadata, "md5Sum", "etag", "expires", xhttp.AmzObjectTagging, "last-modified", VersionPurgeStatusKey)
}

// Filter X-Amz-Storage-Class field only if it is set to STANDARD.

///

Por ejemplo, este validador personalizado comprueba que el ID del ítem empiece con `isbn-` para un número de libro <abbr title="International Standard Book Number – Número Estándar Internacional de Libro">ISBN</abbr> o con `imdb-` para un ID de URL de película de <abbr title="IMDB (Internet Movie Database) es un sitio web con información sobre películas">IMDB</abbr>:

    /**
     * The checksum algorithm.
     */
    interface ChecksumAlgorithm {
        /**
         * Returns the algorithm name, usually used as key, never {@code null} value. The name is a standard name of
         * algorithm (if applicable) or any other designator that is algorithm commonly referred with. Example: "SHA-1".
         */
        @Nonnull
        String getName();

        /**

## Check the username { #check-the-username }

Here's a more complete example.

Use a dependency to check if the username and password are correct.

For this, use the Python standard module <a href="https://docs.python.org/3/library/secrets.html" class="external-link" target="_blank">`secrets`</a> to check the username and password.

// ReturnAll will return all borrowed hashes.
func (h *HashBorrower) ReturnAll() {
	for _, hasher := range h.borrowed {
		h.pool.Put(hasher)
	}
	h.borrowed = nil
}

// StandardClaims are basically standard claims with "accessKey"
type StandardClaims struct {
	AccessKey string `json:"accessKey,omitempty"`
	jwtgo.StandardClaims
}

// UnmarshalJSON provides custom JSON unmarshal.

        // Test with another key usage
        byte[] mac3 = PacMac.calculateMacArcfourHMACMD5(23, key, TEST_DATA);
        assertNotNull(mac3);
        assertEquals(16, mac3.length);

        // Test with a standard usage
        byte[] mac4 = PacMac.calculateMacArcfourHMACMD5(15, key, TEST_DATA);
        assertNotNull(mac4);
        assertEquals(16, mac4.length);
    }

    /**
     * Test method for

    /** LZ77 compression */
    public static final int COMPRESSION_LZ77 = 0x1;
    /** LZ77 + Huffman compression */
    public static final int COMPRESSION_LZ77_HUFFMAN = 0x2;
    /** LZNT1 compression (Windows standard) */
    public static final int COMPRESSION_LZNT1 = 0x3;
    /** Pattern V1 compression */
    public static final int COMPRESSION_PATTERN_V1 = 0x4;

    private int[] compressionAlgorithms;
    private int flags;

            } else {
                return lx - rx;
            }
        };

        Map<String, Lifecycle> lifecyclesMap = lookupLifecycles();

        // ensure canonical order of standard lifecycles
        return lifecyclesMap.values().stream()
                .peek(l -> Objects.requireNonNull(l.getId(), "A lifecycle must have an id."))
                .sorted(Comparator.comparing(Lifecycle::getId, comparator))

import static com.google.common.graph.Graphs.checkNonNegative;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.jspecify.annotations.Nullable;

/**
 * Standard implementation of {@link ValueGraph} that supports the options supplied by {@link
 * AbstractGraphBuilder}.
 *
 * <p>This class maintains a map of nodes to {@link GraphConnections}.
 *

///

/// tip | Consejo

Nota que en este caso estamos usando una función estándar de Python `open()` que interactúa con un archivo.

Entonces, involucra I/O (entrada/salida), que requiere "esperar" para que las cosas se escriban en el disco.

Pero `open()` no usa `async` y `await`.

Por eso, declaramos la función manejadora del evento con `def` estándar en vez de `async def`.

///