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getDefaultOption example

        $options['payload'] = $payload ?? $options['payload'] ?? null;

        foreach ($options as $name => $value) {
            $this->$name = $value;
        }
    }

    protected function normalizeOptions(mixed $options): array
    {
        $normalizedOptions = [];
        $defaultOption = $this->getDefaultOption();
        $invalidOptions = [];
        $missingOptions = array_flip((array) $this->getRequiredOptions());
        $knownOptions = get_class_vars(static::class);

        if (\is_array($options) && isset($options['value']) && !property_exists($this, 'value')) {
            if (null === $defaultOption) {
                throw new ConstraintDefinitionException(sprintf('No default option is configured for constraint "%s".', static::class));
            }

            $options[$defaultOption] = $options['value'];
            unset($options['value']);
        }

/** * {@inheritdoc} */
  public function getDefaultOption() {
    return 'field_name';
  }

  /** * {@inheritdoc} */
  public function getRequiredOptions() {
    return (array) $this->getDefaultOption();
  }

}