public function compatibility() : array
    {
        $compatibility = array_intersect($this->base->compatibility(), $this->booster->compatibility());

        return array_values($compatibility);
    }
public function compatibility() : array
    {
        $compatibility = array_intersect($this->base->compatibility(), $this->booster->compatibility());

        return array_values($compatibility);
    }
public function compatibility ( ) : array { $ compatibility = array_intersect ( $ this -> base -> compatibility ( ) , $ this -> booster -> compatibility ( ) ) ; return array_values ( $ compatibility ) ; }
Return the data types that this estimator is compatible with.

@return int[]
Return the data types that this estimator is compatible with .