we would get a Python `dict` with:

```Python
{
    'username': 'john',
    'password': 'secret',
    'email': '******@****.***',
    'full_name': None,
}
```

#### Unwrapping a `dict`

If we take a `dict` like `user_dict` and pass it to a function (or class) with `**user_dict`, Python will "unwrap" it. It will pass the keys and values of the `user_dict` directly as key-value arguments.

 *
 * <p>If the precondition is not met, the {@code Preconditions} method throws an unchecked exception
 * of a specified type, which helps the method in which the exception was thrown communicate that
 * its caller has made a mistake. This allows constructs such as
 *
 * <pre>{@code
 * public static double sqrt(double value) {
 *   if (value < 0) {
 *     throw new IllegalArgumentException("input is negative: " + value);
 *   }

}

// isTierNameInUse returns tier type and true if there exists a remote tier by
// name tierName, otherwise returns madmin.Unsupported and false. N B this
// function is meant for internal use, where the caller is expected to take
// appropriate locks.
func (config *TierConfigMgr) isTierNameInUse(tierName string) (madmin.TierType, bool) {
	if t, ok := config.Tiers[tierName]; ok {
		return t.Type, true
	}
	return madmin.Unsupported, false

        is ConeUnresolvedNameError -> name
        is ConeUnresolvedReferenceError -> name
        is ConeUnresolvedSymbolError -> classId.shortClassName
        is ConeUnresolvedTypeQualifierError -> {
            // we take the first qualifier part because only the first one can be imported
            qualifiers.firstOrNull()?.name
        }
    }


/**
 * An actual name by which this callable reference was used.
 */

			z.poolMetaMutex.Unlock()
		}

		wk.Take()
		go func(setIdx int) {
			defer wk.Give()
			// We will perpetually retry listing if it fails, since we cannot
			// possibly give up in this matter
			for {
				if contextCanceled(ctx) {
					break
				}

				err := set.listObjectsToDecommission(ctx, bi,
					func(entry metaCacheEntry) {
						wk.Take()
						go decommissionEntry(entry)
					},

		if !groups.Contains(group) {
			continue
		}
		groups.Remove(group)
		c.iamUserGroupMemberships[member] = groups
	}
}

// policyDBGet - lower-level helper; does not take locks.
//
// If a group is passed, it returns policies associated with the group.
//
// If a user is passed, it returns policies of the user along with any groups
// that the server knows the user is a member of.
//

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This schema definition includes your API paths, the possible parameters they take, etc.

#### Data "schema"

The term "schema" might also refer to the shape of some data, like a JSON content.

In that case, it would mean the JSON attributes, and data types they have, etc.

```json
{"message": "Hello World"}
```

...this response will return:

```json
{
  "message": "Hello World"
}
```

Of course, you will probably find much better ways to take advantage of this than formatting JSON. 😉

## Default response class

When creating a **FastAPI** class instance or an `APIRouter` you can specify which response class to use by default.

		if errs[index] != nil {
			parities[index] = -1
			continue
		}
		if !metadata.IsValid() {
			parities[index] = -1
			continue
		}
		// Delete marker or zero byte objects take highest parity.
		if metadata.Deleted || metadata.Size == 0 {
			parities[index] = len(partsMetadata) / 2
		} else {
			parities[index] = metadata.Erasure.ParityBlocks
		}
	}
	return
}