preNormalize example

return $rightSide;
        }

        $this->doValidateType($leftSide);
        $this->doValidateType($rightSide);

        return $this->mergeValues($leftSide, $rightSide);
    }

    final public function normalize(mixed $value): mixed
    {
        $value = $this->preNormalize($value);

        // run custom normalization closures         foreach ($this->normalizationClosures as $closure) {
            $value = $closure($value);
        }

        // resolve placeholder value         if ($value !== $placeholders = self::resolvePlaceholderValue($value)) {
            foreach ($placeholders as $placeholder) {
                $this->handlingPlaceholder = $value;
                try {