```Python hl_lines="10"
    {!> ../../../docs_src/query_params_str_validations/tutorial002_an.py!}
    ```

Notice that the default value is still `None`, so the parameter is still optional.

But now, having `Query(max_length=50)` inside of `Annotated`, we are telling FastAPI that we want it to have **additional validation** for this value, we want it to have maximum 50 characters. 😎

!!! tip

		}
		npages := allocsize / pageSize

		// If the previous sizeclass chose the same
		// allocation size and fit the same number of
		// objects into the page, we might as well
		// use just this size instead of having two
		// different sizes.
		if len(classes) > 1 && npages == classes[len(classes)-1].npages && allocsize/size == allocsize/classes[len(classes)-1].size {
			classes[len(classes)-1].size = size
			continue
		}

			},
			wantBackoffRecord: backoffRecord{
				key:                      "key",
				lastFailureTime:          &defaultTestTime.Time,
				failuresAfterLastSuccess: 2,
			},
		},
		"Backoff store having failure count 2 and one new failure": {
			storeInitializer: func(bis *backoffStore) {
				bis.updateBackoffRecord(backoffRecord{
					key:                      "key",
					failuresAfterLastSuccess: 2,

   * be made {@code static} and its instances can be safely constructed and added in the {@link
   * ServiceManager} constructor without having to close over the partially constructed {@link
   * ServiceManager} instance (i.e. avoid leaking a pointer to {@code this}).
   */
  private final ServiceManagerState state;

// inspection to understand the root cause. E.g, this could be due to
// backend filesystem corruption.

// listOnlineDisks - returns
// - a slice of disks where disk having 'older' xl.meta (or nothing)
// are set to nil.
// - latest (in time) of the maximally occurring modTime(s), which has at least quorum occurrences.

    [Pure, CoreRT_TypedAttributeTrait]> {
  let summary = "Fallback ExecuteOp specialized for tf.BatchFunction.";
  let description = [{
    This kernel executes a variant tf.BatchFunction kernel that supports having
    the `f` attribute as a BEF function.

    Example:
      %res = tfrt_fallback_async.batch_function device("/CPU:0") @f(%input, %captured_input)  {
          num_batch_threads = 1,
          max_batch_size = 4,

	//
	// Stop if we're preemptible, if someone wants to STW, or if
	// someone is calling forEachP.
	//
	// TODO(mknyszek): Consider always checking gp.preempt instead
	// of having the preempt flag, and making an exception for certain
	// mark workers in retake. That might be simpler than trying to
	// enumerate all the reasons why we might want to preempt, even
	// if we're supposed to be mostly non-preemptible.

}

// =======================================================================
// Implementation-specific tests are following.
// The following tests are exercising the details of the implementation
// not the actual user-facing contract of storage interface.
// As such, they may focus e.g. on non-functional aspects like performance
// impact.
// =======================================================================

   * be made {@code static} and its instances can be safely constructed and added in the {@link
   * ServiceManager} constructor without having to close over the partially constructed {@link
   * ServiceManager} instance (i.e. avoid leaking a pointer to {@code this}).
   */
  private final ServiceManagerState state;

        assertFalse(greater.equals(t));
      }
    }
  }

  /**
   * Returns a collection that simulates concurrent modification by having its size method return
   * incorrect values. This is useful for testing methods that must treat the return value from
   * size() as a hint only.
   *