protected function maybeEmptyNumericArrays(array $array, array ...$merge): array
    {
        if (!$merge) { // Save time. Merge is empty?
            return $base; // Nothing to do here.
        }
        foreach ($array as $_key => &$_value) {
            if (is_array($_value)) {
                foreach ($merge as $_merge) {
                    if (array_key_exists($_key, $_merge)) {
                        if (!$_value || $_value === array_values($_value)) {
                            $_value = []; // Empty.
                        } elseif (is_array($_merge[$_key])) {
                            $_value = $this->maybeEmptyNumericArrays($_value, $_merge[$_key]);
                        }
                    }
                } // unset($_merge); // Housekeeping.
            }
        } // unset($_key, $_value); // Housekeeping.

        return $array;
    }