```Python
say_hi()  # Oh non, cela lève une erreur ! 😱
```

Le paramètre `name` est toujours requis (pas facultatif) car il n'a pas de valeur par défaut. En revanche, `name` accepte `None` comme valeur :

```Python
say_hi(name=None)  # Ceci fonctionne, None est valide 🎉
```

La bonne nouvelle, c'est que, dans la plupart des cas, vous pourrez simplement utiliser `|` pour définir des unions de types :

}

// FormatBool prints stringified version of boolean.
func FormatBool(b bool) string {
	if b {
		return "on"
	}
	return "off"
}

// ParseBool returns the boolean value represented by the string.
// It accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False.
// Any other value returns an error.
func ParseBool(str string) (bool, error) {
	switch str {
	case "1", "t", "T", "true", "TRUE", "True", "on", "ON", "On":

            .put("CDN_LOOP", "CDN-Loop")
            .put("ETAG", "ETag")
            .put("SOURCE_MAP", "SourceMap")
            .put("SEC_CH_UA_WOW64", "Sec-CH-UA-WoW64")
            .put("SEC_WEBSOCKET_ACCEPT", "Sec-WebSocket-Accept")
            .put("SEC_WEBSOCKET_EXTENSIONS", "Sec-WebSocket-Extensions")
            .put("SEC_WEBSOCKET_KEY", "Sec-WebSocket-Key")
            .put("SEC_WEBSOCKET_PROTOCOL", "Sec-WebSocket-Protocol")

    public BadWordCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsBadWordCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (BadWordCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public ElevateWordCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsElevateWordCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (ElevateWordCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public JobLogCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsJobLogCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (JobLogCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public PathMappingCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsPathMappingCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (PathMappingCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public ThumbnailQueueCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsThumbnailQueueCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (ThumbnailQueueCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public RoleCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsRoleCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (RoleCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

         * @param stream the {@link Consumer} to process the {@link Stream}
         */
        public void of(final Consumer<Stream<T>> stream) {
            try (Stream<T> s = supplier.get()) {
                stream.accept(s);
            }
        }

        /**
         * Applies the given function to a stream created by the supplier and returns the result.
         * The stream is automatically closed after the function is applied.