checkArgument(type != implementation, "Don't register %s to itself!", type);
    checkArgument(
        !DEFAULTS.containsKey(type), "A default value was already registered for %s", type);
    checkArgument(
        implementations.put(type, implementation) == null,
        "Implementation for %s was already registered",
        type);
  }

  static {
    setImplementation(Appendable.class, StringBuilder.class);

				// Number of probes.
				// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
				_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)

				// Wait time after successful probe in seconds.
				// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 15 secs)
				_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 15)

  // not apply to already started executions.  Defaults to false.
  // +optional
  optional bool suspend = 4;

  // Specifies the job that will be created when executing a CronJob.
  optional JobTemplateSpec jobTemplate = 5;

  // The number of successful finished jobs to retain. Value must be non-negative integer.
  // Defaults to 3.
  // +optional
  optional int32 successfulJobsHistoryLimit = 6;

import (
	"istio.io/istio/pkg/env"
	"istio.io/istio/pkg/log"
)

const (
	// Location to read istioctl defaults from
	defaultIstioctlConfig = "$HOME/.istioctl/config.yaml"
)

var (
	// IstioConfig is the name of the istioctl config file (if any)
	IstioConfig = env.Register("ISTIOCONFIG", defaultIstioctlConfig,
		"Default values for istioctl flags").Get()

	LoggingOptions = defaultLogOptions()

* `tax: float = 10.5` has a default of `10.5`.
* `tags: List[str] = []` has a default of an empty list: `[]`.

but you might want to omit them from the result if they were not actually stored.

For example, if you have models with many optional attributes in a NoSQL database, but you don't want to send very long JSON responses full of default values.

The following arguments are supported:

* `minimum_size` - Do not GZip responses that are smaller than this minimum size in bytes. Defaults to `500`.
* `compresslevel` - Used during GZip compression. It is an integer ranging from 1 to 9. Defaults to `9`. Lower value results in faster compression but larger file sizes, while higher value results in slower compression but smaller file sizes.

## Other middlewares

     * </table>
     * 
     * 
     * Property <tt>jcifs.smb.lmCompatibility</tt> (int, default 3)
     * 
     * @return lanman compatibility level, defaults to 3 i.e. NTLMv2 only
     */
    int getLanManCompatibility ();


    /**
     * 
     * Property <tt>jcifs.smb.allowNTLMFallback</tt> (boolean, default true)
     * 
     * @return whether to allow fallback from kerberos to NTLM
     */

     * Interpolates the values in the given map using the provided callback function.
     * This method defaults to setting empty strings for unresolved placeholders.
     *
     * @param properties The map containing key-value pairs to be interpolated.
     * @param callback The function to resolve variable values not found in the map.
     */
    default void interpolate(@Nonnull Map<String, String> properties, @Nullable Function<String, String> callback) {

  // +optional
  optional string host = 1;

  // IngressRuleValue represents a rule to route requests for this IngressRule.
  // If unspecified, the rule defaults to a http catch-all. Whether that sends
  // just traffic matching the host to the default backend or all traffic to the
  // default backend, is left to the controller fulfilling the Ingress. Http is
  // currently the only supported IngressRuleValue.
  // +optional

	MaxTimeout = "max_timeout"

	// HelpDrive is help for drive
	HelpDrive = config.HelpKVS{
		config.HelpKV{
			Key:         MaxTimeout,
			Type:        "string",
			Description: "set per call max_timeout for the drive, defaults to 30 seconds",
			Optional:    true,
		},
	}