// These contain bytes not in the decodabet.
    assertFailsToDecode(base16(), "\n\n", "Unrecognized character: 0xa");
    assertFailsToDecode(base16(), "EFGH", "Unrecognized character: G");
    // Valid base16 strings always have an even length.
    assertFailsToDecode(base16(), "A", "Invalid input length 1");
    assertFailsToDecode(base16(), "ABC");
    // These have a combination of invalid length and unrecognized characters.

// handlers.
//
// It is set per-"handler function registration" in the router to allow for
// behavior modification via flags.
//
// This middleware always calls `collectAPIStats` to collect API stats.
//
// The passed in handler function must be a method of `objectAPIHandlers` for
// the name displayed in logs and trace to be accurate. The name is extracted
// via reflection.

Do you like **FastAPI**?

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Or would you like to get help with **FastAPI**?

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## Subscribe to the newsletter { #subscribe-to-the-newsletter }

		// x-amz-security-token is not allowed for anonymous access.
		return nil, ErrNoAccessKey
	}

	if token == "" && cred.IsTemp() && !cred.IsServiceAccount() {
		// Temporary credentials should always have x-amz-security-token
		return nil, ErrInvalidToken
	}

	if token != "" && !cred.IsTemp() {
		// x-amz-security-token should not present for static credentials.
		return nil, ErrInvalidToken
	}

        <version>${j2objc.version}</version>
      </dependency>
      <!--
      We moved away from using dependencyManagement for test-only deps because of https://github.com/google/guava/issues/6654.
      We could probably have resumed it after https://github.com/google/guava/pull/6664.
      But it's always weird that published poms reference test-only libraries at all, so I'm not in any rush to do so.
      -->

        <version>${j2objc.version}</version>
      </dependency>
      <!--
      We moved away from using dependencyManagement for test-only deps because of https://github.com/google/guava/issues/6654.
      We could probably have resumed it after https://github.com/google/guava/pull/6664.
      But it's always weird that published poms reference test-only libraries at all, so I'm not in any rush to do so.
      -->

            or from the POM.
          </description>
        </field>
        <field>
          <name>alias</name>
          <version>1.0.0+</version>
          <type>String</type>
          <description>
            Specifies an alias which can be used to configure this parameter from the POM.

        this.errorCode = errorCode
        notifyAll()
      }
    }
  }

  /**
   * Returns true if read timeouts should be enforced while reading response headers or body bytes.
   * We always do timeouts in the HTTP server role. For clients, we only do timeouts after the
   * request is transmitted. This is only interesting for duplex calls where the request and
   * response may be interleaved.
   *

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial009_py39.py!}
```

Using `Optional[str]` instead of just `str` will let the editor help you detect errors where you could be assuming that a value is always a `str`, when it could actually be `None` too.

`Optional[Something]` is actually a shortcut for `Union[Something, None]`, they are equivalent.

This also means that in Python 3.10, you can use `Something | None`:

   * {@code expectedOldCount} times, no changes will be made.
   *
   * @return {@code true} if the change was successful. This usually indicates that the multiset has
   *     been modified, but not always: in the case that {@code expectedOldCount == newCount}, the
   *     method will return {@code true} if the condition was met.
   * @throws IllegalArgumentException if {@code expectedOldCount} or {@code newCount} is negative
   */