Update docblocks.

src/Cache/Engine/FileEngine.php

@@ -417,16 +417,13 @@ class FileEngine extends CacheEngine
     }
 
     /**
-     * Generates a safe key for use with cache engine storage engines.
-     *
-     * @param string $key the key passed over
-     * @return mixed string $key or false
+     * @inheritDoc
      */
     protected function _key($key)
     {
         $key = parent::_key($key);
 
-        if (preg_match('/[\/\\<>?:|*"]/', (string)$key)) {
+        if (preg_match('/[\/\\<>?:|*"]/', $key)) {
             throw new InvalidArgumentException(
                 "Cache key `{$key}` contains invalid characters. " .
                 'You cannot use /, \\, <, >, ?, :, |, *, or " in cache keys.'

src/Controller/Component/RequestHandlerComponent.php

@@ -377,7 +377,7 @@ class RequestHandlerComponent extends Component
      *
      * @param string|array|null $type An optional array of 'friendly' content-type names, i.e.
      *   'html', 'xml', 'js', etc.
-     * @return mixed If $type is null or not provided, the first content-type in the
+     * @return string|bool|null If $type is null or not provided, the first content-type in the
      *    list, based on preference, is returned. If a single type is provided
      *    a boolean will be returned if that type is preferred.
      *    If an array of types are provided then the first preferred type is returned.

src/Core/ClassLoader.php

@@ -97,7 +97,7 @@ class ClassLoader
      *
      * @param string $prefix The namespace prefix.
      * @param string $relativeClass The relative class name.
-     * @return mixed Boolean false if no mapped file can be loaded, or the
+     * @return string|false Boolean false if no mapped file can be loaded, or the
      * name of the mapped file that was loaded.
      */
     protected function _loadMappedFile(string $prefix, string $relativeClass)

src/Datasource/RulesChecker.php

@@ -288,7 +288,7 @@ class RulesChecker
      *
      * @param \Cake\Datasource\EntityInterface $entity The entity to check for validity.
      * @param array $options Extra options to pass to checker functions.
-     * @param array $rules The list of rules that must be checked.
+     * @param callable[] $rules The list of rules that must be checked.
      * @return bool
      */
     protected function _checkRules(EntityInterface $entity, array $options = [], array $rules = []): bool

src/ORM/EagerLoader.php

@@ -753,7 +753,7 @@ class EagerLoader
      * Helper function used to return the keys from the query records that will be used
      * to eagerly load associations.
      *
-     * @param array $external the list of external associations to be loaded
+     * @param \Cake\ORM\EagerLoadable[] $external the list of external associations to be loaded
      * @param \Cake\ORM\Query $query The query from which the results where generated
      * @param \Cake\Database\Statement\BufferedStatement $statement The statement to work on
      * @return array
@@ -761,7 +761,6 @@ class EagerLoader
     protected function _collectKeys(array $external, Query $query, $statement): array
     {
         $collectKeys = [];
-        /* @var \Cake\ORM\EagerLoadable $meta */
         foreach ($external as $meta) {
             $instance = $meta->instance();
             if (!$instance->requiresKeys($meta->getConfig())) {

src/ORM/Table.php

@@ -1347,7 +1347,7 @@ class Table implements RepositoryInterface, EventListenerInterface, EventDispatc
      * composite keys when comparing values.
      *
      * @param array $options the original options passed to a finder
-     * @param array $keys the keys to check in $options to build matchers from
+     * @param string[] $keys the keys to check in $options to build matchers from
      * the associated value
      * @return array
      */
@@ -2259,7 +2259,7 @@ class Table implements RepositoryInterface, EventListenerInterface, EventDispatc
      *
      * @param string $method The method name that was fired.
      * @param array $args List of arguments passed to the function.
-     * @return mixed
+     * @return \Cake\ORM\Query
      * @throws \BadMethodCallException when there are missing arguments, or when
      *  and & or are combined.
      */