concrete/src/Service/Rule/Option.php
public function isRequired()
    {
        $result = $this->required;
        if (is_callable($result)) {
            $result = $result($this);
        }

        return (bool) $result;
    }
public function isRequired()
    {
        $result = $this->required;
        if (is_callable($result)) {
            $result = $result($this);
        }

        return (bool) $result;
    }
public function isRequired ( ) { $ result = $ this -> required ; if ( is_callable ( $ result ) ) { $ result = $ result ( $ this ) ; } return ( bool ) $ result ; }
Is this option required?

@return bool
Is this option required?