+ "\u200a\u0000\u0000\u0000\u0000\u0000\u205f\u1680\u0000\u0000\u180e\u0000\u0000\u0000";

  public static final CharMatcher OLD_WHITESPACE =
      new CharMatcher() {
        @Override
        public boolean matches(char c) {
          return OLD_WHITESPACE_TABLE.charAt(c % 79) == c;
        }
      };

  @Param private boolean useNew;

  @Param({"20", "50", "80"})

            if (msg == null) {
                msg = "";
            }
        }

        return msg;
    }

    public Severity getSeverity() {
        return severity;
    }

    @Override
    public String toString() {
        StringBuilder buffer = new StringBuilder(128);

        buffer.append('[').append(getSeverity()).append("] ");
        buffer.append(getMessage());

It won't do any data conversion with Pydantic models, it won't convert the contents to any type, etc.

This gives you a lot of flexibility. You can return any data type, override any data declaration or validation, etc.

## Using the `jsonable_encoder` in a `Response`

Because **FastAPI** doesn't make any changes to a `Response` you return, you have to make sure its contents are ready for it.

    NullabilityBreakingChangesRule(Map<String, Object> params) {
        super(params)
    }

    @Override
    Violation maybeViolation(JApiCompatibility member) {

        if (isNewOrRemoved(member)) {
            return null
        }

        List<String> warnings = []
        List<String> errors = []

    private final StringBuilder input = new StringBuilder();
    private int pos;
    private int markPos;

    JavadocScanner(String rawCommentText) {
        pushText(rawCommentText);
    }

    @Override
    public String toString() {
        return input.substring(pos);
    }

    public boolean isEmpty() {
        return pos == input.length();
    }

    public void mark() {
        markPos = pos;

////

### Settings and testing

Then it would be very easy to provide a different settings object during testing by creating a dependency override for `get_settings`:

```Python hl_lines="9-10  13  21"
{!../../docs_src/settings/app02/test_main.py!}
```

In the dependency override we set a new value for the `admin_email` when creating the new `Settings` object, and then we return that new object.

Then we can test that it is used.

        new Iterable<Object>() {
          @Override
          public Iterator<Object> iterator() {
            return emptyList().iterator();
          }
        });

    list.add("a");
    try {
      assertEmpty(list);
      throw new Error();
    } catch (AssertionFailedError expected) {
    }
    try {
      assertEmpty(
          new Iterable<String>() {
            @Override

        singleton(e4()),
        features,
        copyToList(getOrderedElements()),
        0) {
      @Override
      protected ListIterator<E> newTargetIterator() {
        resetCollection();
        return getList().listIterator();
      }

      @Override
      protected void verify(List<E> elements) {
        expectContents(elements);
      }
    }.test();
  }

        new Iterable<Object>() {
          @Override
          public Iterator<Object> iterator() {
            return emptyList().iterator();
          }
        });

    list.add("a");
    try {
      assertEmpty(list);
      throw new Error();
    } catch (AssertionFailedError expected) {
    }
    try {
      assertEmpty(
          new Iterable<String>() {
            @Override

  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(
        MapTestSuiteBuilder.using(
                new TestStringMapGenerator() {
                  @Override
                  protected Map<String, String> create(Entry<String, String>[] entries) {
                    Map<String, String> map = CompactHashMap.create();
                    for (Entry<String, String> entry : entries) {