the arguments to the function for it to work correctly, otherwise the values will be different from what you expect (e.g. `QueryInfo` or something similar instead of `str`). And your editor won't complain, and Python won't complain running that function, only when the operations inside error out.

Because `Annotated` can have more than one metadata annotation, you could now even use the same function with other tools, like <a href="https://typer.tiangolo.com/" class="external-link" targe...

If you added the return type annotation, tools and editors would complain with a (correct) error telling you that your function is returning a type (e.g. a dict) that is different from what you declared (e.g. a Pydantic model).

But you still need to use `Path` for the `item_id` path parameter. And you don't want to use `Annotated` for some reason.

Python will complain if you put a value with a "default" before a value that doesn't have a "default".

But you can re-order them, and have the value without a default (the query parameter `q`) first.

    PeekingIterator<?> peekingIterator = Iterators.peekingIterator(iterator);

    assertEquals("A", peekingIterator.next());
    assertEquals("B", peekingIterator.peek());

    /* Should complain on attempt to remove() after peek(). */
    assertThrows(IllegalStateException.class, () -> peekingIterator.remove());

    assertEquals(

    class DoShareEnumValidation {

        static Stream<Arguments> invalidShareEnumCases() {
            return Stream.of(
                    // Missing trailing slash -> should complain about directory ending
                    Arguments.of("smb://server/share", "/share", true),
                    // Not a server root -> invalid list operation

   * getAnnotatedBounds()} method, then its return type means it won't compile on Android, while if
   * we don't include the method, then the compiler will complain that an abstract method is
   * unimplemented. So instead we use a dynamic proxy to get an implementation. If the method being
   * called on the {@code TypeVariable} instance has the same name as one of the public methods of

   * getAnnotatedBounds()} method, then its return type means it won't compile on Android, while if
   * we don't include the method, then the compiler will complain that an abstract method is
   * unimplemented. So instead we use a dynamic proxy to get an implementation. If the method being
   * called on the {@code TypeVariable} instance has the same name as one of the public methods of

Now we use `response_model=HeroPublic` instead of the **return type annotation** `-> HeroPublic` because the value that we are returning is actually *not* a `HeroPublic`.

If we had declared `-> HeroPublic`, your editor and linter would complain (rightfully so) that you are returning a `Hero` instead of a `HeroPublic`.

	_, s3Error = parseLocationConstraint(r)
	if s3Error != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
		return
	}

	// check if client is attempting to create more buckets, complain about it.
	if currBuckets := globalBucketMetadataSys.Count(); currBuckets+1 > maxBuckets {
		internalLogIf(ctx, fmt.Errorf("Please avoid creating more buckets %d beyond recommended %d", currBuckets+1, maxBuckets), logger.WarningKind)

This is something that you have to do yourself in your code, and make sure you use those JSON keys.

It's almost the only thing that you have to remember to do correctly yourself, to be compliant with the specifications.

For the rest, **FastAPI** handles it for you.

///

## Update the dependencies { #update-the-dependencies }

Now we are going to update our dependencies.