rule example

    /** * Sets an expression to run for the validation. * * The expression receives the value of the node and must return it. It can * modify it. * An exception should be thrown when the node is not valid. */
    public function validate(): ExprBuilder
    {
        return $this->validation()->rule();
    }

    /** * Sets whether the node can be overwritten. * * @return $this */
    public function cannotBeOverwritten(bool $deny = true): static
    {
        $this->merge()->denyOverwrite($deny);