* 📝 Update docs, remove references to removed `pydantic.Required` in `docs/en/docs/tutorial/query-params-str-validations.md`. PR [#10469](https://github.com/tiangolo/fastapi/pull/10469) by [@yogabonito](https://github.com/yogabonito).
* ✏️ Fix typo in `docs/en/docs/reference/index.md`. PR [#10467](https://github.com/tiangolo/fastapi/pull/10467) by [@tarsil](https://github.com/tarsil).

     * from the remote peer or cache.
     */
    internal fun addLenient(
      name: String,
      value: String,
    ) = commonAddLenient(name, value)

    fun removeAll(name: String) = commonRemoveAll(name)

    /**
     * Set a field with the specified value. If the field is not found, it is added. If the field is
     * found, the existing values are replaced.
     */

   * class, we use a suboptimal int[] representation to avoid introducing a new type that can impede
   * class-unloading when ThreadLocals are not removed.
   */
  static final ThreadLocal<int @Nullable []> threadHashCode = new ThreadLocal<>();

  /** Generator of new random hash codes */
  static final Random rng = new Random();

## Version 3.13.1

_2019-02-05_

 *  Fix: Don't crash when using a custom `X509TrustManager` or `SSLSocket` on Android. When we
    removed obsolete code for Android 4.4 we inadvertently also removed support for custom
    subclasses. We've restored that support!


## Version 3.13.0

_2019-02-04_

    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(new FakeTicker());
  }

  @GwtIncompatible // java.time.Duration
  @IgnoreJRERequirement // TODO: b/288085449 - Remove this once we use library-desugaring scents.
  public void testAdvance() {
    FakeTicker ticker = new FakeTicker();
    assertEquals(0, ticker.read());
    assertSame(ticker, ticker.advance(10));

    assertThrows(UnsupportedOperationException.class, () -> reverse.remove(4));
  }

  void ensureNotDirectlyModifiable(SortedSet<Integer> unmod) {
    try {
      unmod.add(4);
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      unmod.remove(4);
      fail("UnsupportedOperationException expected");

    }

    public void mymodifyProperty(String propertyName) {
        registerModifiedProperty(propertyName);
    }

    public void mymodifyPropertyCancel(String propertyName) {
        __modifiedProperties.remove(propertyName);
    }

    public void clearModifiedInfo() {
        __modifiedProperties.clear();
    }

    public boolean hasModification() {
        return !__modifiedProperties.isEmpty();
    }

    assertTrue(result.remove(v0()));
    assertFalse(multimap().containsEntry(k0(), v0()));
    assertEquals(2, multimap().size());
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testPropagatesRemoveLastElementToMultimap() {
    Collection<V> result = multimap().get(k0());
    assertTrue(result.remove(v0()));
    assertGet(k0());
  }

    }
  }

  /**
   * Precondition tester for {@code Iterator.remove()} that throws an exception with a consistent
   * error message.
   */
  static void checkRemove(boolean canRemove) {
    checkState(canRemove, "no calls to next() since the last call to remove()");
  }

  private CollectPreconditions() {}

        assertArgumentNotNull("enumeration", enumeration);
        this.enumeration = enumeration;
    }

    @Override
    public void remove() {
        throw new ClUnsupportedOperationException("remove");
    }

    @Override
    public boolean hasNext() {
        return enumeration.hasMoreElements();
    }

    @Override
    public T next() {