ValidationBuilder example

        $this->merge()->denyOverwrite($deny);

        return $this;
    }

    /** * Gets the builder for validation rules. */
    protected function validation(): ValidationBuilder
    {
        return $this->validation ??= new ValidationBuilder($this);
    }

    /** * Gets the builder for merging rules. */
    protected function merge(): MergeBuilder
    {
        return $this->merge ??= new MergeBuilder($this);
    }

    /** * Gets the builder for normalization rules. */