/** The tag class this adapter expects, or -1 to match any tag class. */
  val tagClass: Int,
  /** The tag this adapter expects, or -1 to match any tag. */
  val tag: Long,
  /** Encode and decode the value once tags are handled. */
  private val codec: Codec<T>,
  /** True if the default value should be used if this value is absent during decoding. */
  val isOptional: Boolean = false,

    ],
)

# Compliance test for modules and for interface
tf_cc_test(
    name = "modular_filesystem_test",
    size = "small",
    srcs = ["modular_filesystem_test.cc"],
    linkopts = ["-ldl"],
    tags = [
        "manual",  # Requires DSOs as arguments, eventual setup
        "notap",  # b/139060984, requires implementing modular support for Google filesystem
    ],
    deps = [
        ":modular_filesystem",

#### 具有与默认值相同值的数据

如果数据具有与默认值相同的值，例如 ID 为 `baz` 的项：

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

即使 `description`、`tax` 和 `tags` 具有与默认值相同的值，FastAPI 足够聪明 (实际上是 Pydantic 足够聪明) 去认识到这一点，它们的值被显式地所设定（而不是取自默认值）。

因此，它们将包含在 JSON 响应中。

!!! tip
    请注意默认值可以是任何值，而不仅是`None`。

ID가 `baz`인 항목(items)처럼 기본값과 동일한 값을 갖는다면:

```Python hl_lines="3  5-6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

`description`, `tax` 그리고 `tags`가 기본값과 같더라도 (기본값에서 가져오는 대신) 값들이 명시적으로 설정되었다는 것을 인지할 정도로 FastAPI는 충분히 똑똑합니다(사실, Pydantic이 충분히 똑똑합니다).

따라서 JSON 스키마에 포함됩니다.

!!! tip "팁"
    `None` 뿐만 아니라 다른 어떤 것도 기본값이 될 수 있습니다.

## Contents properties

All properties except the file size are tied to the zip file. This means that modification date, headers, tags, etc. can only be set for the zip file as a whole. In similar fashion, replication will replicate the zip file as a whole and not individual files.

## Code Examples

-   [Issue tracker: Report a defect or feature request](https://github.com/google/guava/issues/new)
-   [StackOverflow: Ask "how-to" and "why-didn't-it-work" questions](https://stackoverflow.com/questions/ask?tags=guava+java)
-   [guava-discuss: For open-ended questions and discussion](https://groups.google.com/group/guava-discuss)

## IMPORTANT WARNINGS

1. APIs marked with the `@Beta` annotation at the class or method level

ID`baz`のitemのようにデフォルト値と同じ値を持つデータの場合:

```Python hl_lines="3 5 6"
{
    "name": "Baz",
    "description": None,
    "price": 50.2,
    "tax": 10.5,
    "tags": []
}
```

FastAPIは十分に賢いので（実際には、Pydanticが十分に賢い）`description`や`tax`、`tags`はデフォルト値と同じ値を持っているにもかかわらず、明示的に設定されていることを理解しています。（デフォルトから取得するのではなく）

そのため、それらはJSONレスポンスに含まれることになります。

!!! tip "豆知識"
    デフォルト値は`None`だけでなく、なんでも良いことに注意してください。

- Creation of STS credentials
- Creation and deletion of service accounts (except those owned by the root user)
- Changes to Bucket features such as:
  - Bucket Policies
  - Bucket Tags
  - Bucket Object-Lock configurations (including retention and legal hold configuration)
  - Bucket Encryption configuration

```

- List the current settings

```
$ mc ilm ls play/testbucket
     ID     |  Prefix  |  Enabled   | Expiry |  Date/Days   |  Transition  |    Date/Days     |  Storage-Class   |       Tags
------------|----------|------------|--------|--------------|--------------|------------------|------------------|------------------

# Also ignore etcd installed by hack/install-etcd.sh
/third_party/etcd*
/default.etcd

# Also ignore protoc installed by hack/install-protoc.sh
/third_party/protoc*

# User cluster configs
.kubeconfig

.tags*

# Version file for dockerized build
.dockerized-kube-version-defs

# Web UI
/www/master/node_modules/
/www/master/npm-debug.log
/www/master/shared/config/development.json

# Karma output
/www/test_out