PHP 8.5 compatibility

Problem/Motivation

The code contains a non-canonical scalar type cast, like (boolean), which is deprecated in PHP 8.5. The alternate type names are not supported in parameter, return, or property types, either.

https://php.watch/versions/8.5/boolean-double-integer-binary-casts-depre...

Steps to reproduce

  protected function createDbQuery(QueryInterface $query, array $fields) {
    $keys = &$query->getKeys();
    $keys_set = (boolean) $keys;

and

              // Make sure the value is never negative.
              $value = max($value, 0);
              $item->setBoost($item->getBoost() * (double) $value * (double) $settings['boost_factor']);

and

      $item_boost = (double) ($boosts[$datasource_id]['datasource_boost'] ?? 1.0);
      if ($bundle && isset($boosts[$datasource_id]['bundle_boosts'][$bundle])) {
        $item_boost = (double) $boosts[$datasource_id]['bundle_boosts'][$bundle];
      }

Search the code using the regex \(integer\)|\(boolean\)|\(double\)|\(binary\) to find type casts. There may be parameters, return types, or property types that need to be updated as well.

Proposed resolution

int instead of integer
float instead of double
bool instead of boolean
string instead of binary

Remaining tasks