Implement level 6 PHPStan fixes

src/Mapper/ArrayMapper.php

@@ -10,6 +10,8 @@ namespace BitBadger\PDODocument\Mapper;
 
 /**
  * A mapper that returns the associative array from the database
+ *
+ * @implements Mapper<array<int|string, mixed>>
  */
 class ArrayMapper implements Mapper
 {

src/Mapper/CountMapper.php

@@ -10,6 +10,8 @@ namespace BitBadger\PDODocument\Mapper;
 
 /**
  * A mapper that returns the integer value of the first item in the results
+ *
+ * @implements Mapper<int>
  */
 class CountMapper implements Mapper
 {

src/Mapper/DocumentMapper.php

@@ -31,7 +31,7 @@ class DocumentMapper implements Mapper
     /**
      * Map a result to a domain class instance
      *
-     * @param array $result An associative array representing a single database result
+     * @param array<int|string, mixed> $result An associative array representing a single database result
      * @return TDoc The document, deserialized from its JSON representation
      * @throws DocumentException If the JSON cannot be deserialized
      */

src/Mapper/ExistsMapper.php

@@ -13,6 +13,8 @@ use Exception;
 
 /**
  * Map an EXISTS result to a boolean value
+ *
+ * @implements Mapper<bool>
  */
 class ExistsMapper implements Mapper
 {

src/Mapper/Mapper.php

@@ -18,7 +18,7 @@ interface Mapper
     /**
      * Map a result to the specified type
      *
-     * @param array $result An associative array representing a single database result
+     * @param array<int|string, mixed> $result An associative array representing a single database result
      * @return T The item mapped from the given result
      */
     public function map(array $result): mixed;