*
     * Library modules (including library sources) do not need to be considered modified, so any caches related to library modules and their
     * contents may be kept.
     *
     * @see KotlinModificationTopics
     */
    public fun onModification()

                }
                false
            }
            else -> {
                true
            }
        }

        override fun visitCollection(source: FileCollectionInternal.Source, contents: Iterable<File>) =
            throw UnsupportedOperationException()

        override fun visitFileTree(root: File, patterns: PatternSet, fileTree: FileTreeInternal) {

Let's say you only have a single `item` body parameter from a Pydantic model `Item`.

By default, **FastAPI** will then expect its body directly.

But if you want it to expect a JSON with a key `item` and inside of it the model contents, as it does when you declare extra body parameters, you can use the special `Body` parameter `embed`:

```Python
item: Item = Body(embed=True)
```

as in:

=== "Python 3.10+"