}
        reportAccess(key, oldValue);
        if (hadValue) {
            // The configuration cache uses onRemove callback to remember that the property has to be removed.
            // Of course, the property has to be removed in the cached run only if it was removed in the
            // non-cached run first. Changing the value of the property would invalidate the cache and recalculate the removal.

    hashed_password = hashed_password,
)
```

!!! warning
    The supporting additional functions are just to demo a possible flow of the data, but they of course are not providing any real security.

## Reduce duplication

Reducing code duplication is one of the core ideas in **FastAPI**.

 * not have a (declared) member scope.
 *
 * Members declared by the enum class and overridden in the enum entry's body will be accessible, of course, but only the base version
 * declared in the enum class. For example, a narrowed return type of an overridden member in an enum entry's body will not be visible
 * outside the body.
 *
 * #### Example
 *
 * ```kotlin

# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#

eval "set -- $(
        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
        xargs -n1 |

====

This sample uses this feature to configure an additional repository to be used only for specific environments.

[source.multi-language-sample,kotlin]
----
> gradle --init-script init.gradle.kts -q showRepos
include::{snippetsPath}/initScripts/configurationInjection/tests-common/initScriptConfiguration.out[]
----
[source.multi-language-sample,groovy]
----
> gradle --init-script init.gradle -q showRepos

| `Forwarded`   | For outgoing requests, the original source IP. Note that since we spoof IPs in most cases, this usually is the same as the actual IP seen. For incoming requests, this is used only for traffic from waypoints (which are trusted and cannot spoof IPs) |

// _objc_msgSend_uncached which ends up in
// WAITING_FOR_ANOTHER_THREAD_TO_FINISH_CALLING_+initialize. Of course,
// whatever thread the child is waiting for is in the parent process and
// is not going to finish anything in the child process. There is no
// public source code for these routines, so it is unclear exactly what
// the problem is. An Apple engineer suggests using xpc_date_create_from_current,

			}
			sum := c.add(extra)
			debugPrintf("releaseLock %s: flush extra=%d -> count=%d\n", c.name, extra, sum)
		}

		// Took care of refreshing ptr and flushing extra.
		// Now we can release the lock, unless of course
		// another goroutine cleared havePtr or added to extra,
		// in which case we go around again.
		if !c.state.update(&state, state.clearLocked()) {
			continue
		}

<img src="/img/tutorial/security/image02.png">

!!! note
    It doesn't matter what you type in the form, it won't work yet. But we'll get there.

This is of course not the frontend for the final users, but it's a great automatic tool to document interactively all your API.

It can be used by the frontend team (that can also be yourself).

# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#

eval "set -- \$(
        printf '%s\\n' "\$DEFAULT_JVM_OPTS \$JAVA_OPTS \$${optsEnvironmentVar}" |
        xargs -n1 |