[9.x] Remove useless reduceWithKeys method

src/Illuminate/Collections/Traits/EnumeratesValues.php

@@ -802,21 +802,6 @@ class_basename(static::class), gettype($result)
         return $result;
     }
 
-    /**
-     * Reduce an associative collection to a single value.
-     *
-     * @template TReduceWithKeysInitial
-     * @template TReduceWithKeysReturnType
-     *
-     * @param  callable(TReduceWithKeysInitial|TReduceWithKeysReturnType, TValue): TReduceWithKeysReturnType  $callback
-     * @param  TReduceWithKeysInitial  $initial
-     * @return TReduceWithKeysReturnType
-     */
-    public function reduceWithKeys(callable $callback, $initial = null)
-    {
-        return $this->reduce($callback, $initial);
-    }
-
     /**
      * Create a collection of all elements that do not pass a given truth test.
      *

tests/Support/SupportCollectionTest.php

@@ -3963,20 +3963,6 @@ public function testReduce($collection)
         }));
     }
 
-    /**
-     * @dataProvider collectionClassProvider
-     */
-    public function testReduceWithKeys($collection)
-    {
-        $data = new $collection([
-            'foo' => 'bar',
-            'baz' => 'qux',
-        ]);
-        $this->assertSame('foobarbazqux', $data->reduceWithKeys(function ($carry, $element, $key) {
-            return $carry .= $key.$element;
-        }));
-    }
-
     /**
      * @dataProvider collectionClassProvider
      */

types/Support/Collection.php

@@ -547,21 +547,6 @@
         return 1;
     }, 0));
 
-assertType('int', $collection
-    ->reduceWithKeys(function ($null, $user) {
-        assertType('User', $user);
-        assertType('int|null', $null);
-
-        return 1;
-    }));
-assertType('int', $collection
-    ->reduceWithKeys(function ($int, $user) {
-        assertType('User', $user);
-        assertType('int', $int);
-
-        return 1;
-    }, 0));
-
 assertType('Illuminate\Support\Collection<int, int>', $collection::make([1])->replace([1]));
 assertType('Illuminate\Support\Collection<int, User>', $collection->replace([new User]));
 

types/Support/LazyCollection.php

@@ -546,21 +546,6 @@
         return 1;
     }, 0));
 
-assertType('int', $collection
-    ->reduceWithKeys(function ($null, $user) {
-        assertType('User', $user);
-        assertType('int|null', $null);
-
-        return 1;
-    }));
-assertType('int', $collection
-    ->reduceWithKeys(function ($int, $user) {
-        assertType('User', $user);
-        assertType('int', $int);
-
-        return 1;
-    }, 0));
-
 assertType('Illuminate\Support\LazyCollection<int, int>', $collection::make([1])->replace([1]));
 assertType('Illuminate\Support\LazyCollection<int, User>', $collection->replace([new User]));