// If there are multiple workloads in the Instance, the first is used.
	// Can be used with `ToWorkload: to.WithWorkloads(someWl)` to send to a specific workload.
	// When using the Port field, the ServicePort should be used.
	ToWorkload Instance

	// Port to be used for the call. Ignored if Scheme == DNS. If the Port.ServicePort is set,

    for (Operation* user :
         llvm::make_early_inc_range(cluster_result.getUsers())) {
      // Check that user has no outputs that are TPUPartitionedOutputV2
      for (auto result : user->getResults()) {
        for (Operation* user : llvm::make_early_inc_range(result.getUsers())) {
          if (llvm::isa<TF::TPUPartitionedOutputV2Op>(user)) {
            user->emitError() << "Input of TPUPartitionedOutputV2 must "

These features are what Marshmallow was built to provide. It is a great library, and I have used it a lot before.

But it was created before there existed Python type hints. So, to define every <abbr title="the definition of how data should be formed">schema</abbr> you need to use specific utils and classes provided by Marshmallow.

!!! check "Inspired **FastAPI** to"
    Use code to define "schemas" that provide data types and validation, automatically.

/**
 * <p>A mapping provider that uses a transform for which {@link MappingProvider} cannot be used.
 * This implementation is used for user provided transforms and also for internal transforms that don't meet the constraints of {@link MappingProvider}.</p>
 *
 * <p>This provider checks that the contents of value have been built prior to running the transform, as the transform may use the content.

## Advanced User Guide

There is also an **Advanced User Guide** that you can read later after this **Tutorial - User guide**.

The **Advanced User Guide**, builds on this, uses the same concepts, and teaches you some extra features.

But you should first read the **Tutorial - User Guide** (what you are reading right now).

			auditID = newAuditIDFunc()
		}

		// Note: we save the user specified value of the Audit-ID header as is, no truncation is performed.
		audit.WithAuditID(ctx, types.UID(auditID))

		// We echo the Audit-ID in to the response header.
		// It's not guaranteed Audit-ID http header is sent for all requests.
		// For example, when user run "kubectl exec", apiserver uses a proxy handler

	userKubeconfigLongDesc = cmdutil.LongDesc(`
	Output a kubeconfig file for an additional user.
	`)

	userKubeconfigExample = cmdutil.Examples(`
	# Output a kubeconfig file for an additional user named foo
	kubeadm kubeconfig user --client-name=foo

	# Output a kubeconfig file for an additional user named foo using a kubeadm config file bar
	kubeadm kubeconfig user --client-name=foo --config=bar
	`)
)

/**
 * Policy on choosing which connection to use for an exchange and any retries that follow. This uses
 * the following strategies:
 *
 *  1. If the current call already has a connection that can satisfy the request it is used. Using
 *     the same connection for an initial exchange and its follow-ups may improve locality.
 *
 *  2. If there is a connection in the pool that can satisfy the request it is used. Note that it is

}

// Example 3: A user-defined flag type, a slice of durations.
type interval []time.Duration

// String is the method to format the flag's value, part of the flag.Value interface.
// The String method's output will be used in diagnostics.
func (i *interval) String() string {
	return fmt.Sprint(*i)
}

// Set is the method to set the flag value, part of the flag.Value interface.

Instead, you want to provide a different dependency that will be used only during tests (possibly only some specific tests), and will provide a value that can be used where the value of the original dependency was used.

### Use cases: external service

An example could be that you have an external authentication provider that you need to call.

You send it a token and it returns an authenticated user.