bug fix omg

src/Itera.php

@@ -73,6 +73,13 @@ public static function adjust(iterable $input, ?callable $values = null, ?callab
             return self::reindex($input, $keys);
         }
         // Map both values and keys.
+        // Note: This method does not contain yield, thus is not a generator function itself, but returns generators.
+        //       That's why the `remap` is separated into a private method.
+        return self::remap($input, $values, $keys);
+    }
+
+    private static function remap(iterable $input, callable $values, callable $keys): iterable
+    {
         foreach ($input as $key => $value) {
             yield $keys($value, $key) => $values($value, $key);
         }

tests/map.phpt

@@ -93,6 +93,34 @@ require_once __DIR__ . '/../vendor/autoload.php';
         input: ['zero', 'one', 'two', 'three',],
         description: 'Should map values and keys based on values and keys',
     );
+
+    // Actually we may use the same test for `adjust`.
+    DashTest::assert(
+        callChain: [
+            new Call(
+                method: 'adjust',
+                keys: fn($v, $k) => 'the key for ' . $v . ' is ' . $k,
+            ),
+            new Call(
+                method: 'adjust',
+                values: fn($v, $k) => 'but the key for ' . $v . ' has since changed to "' . $k . '"',
+            ),
+        ],
+        assertion: function (iterable $result, ?string $desc) {
+            Assert::same(
+                [
+                    'the key for zero is 0' => 'but the key for zero has since changed to "the key for zero is 0"',
+                    'the key for one is 1' => 'but the key for one has since changed to "the key for one is 1"',
+                    'the key for two is 2' => 'but the key for two has since changed to "the key for two is 2"',
+                    'the key for three is 3' => 'but the key for three has since changed to "the key for three is 3"',
+                ],
+                Itera::toArray($result),
+                $desc,
+            );
+        },
+        input: ['zero', 'one', 'two', 'three',],
+        description: 'Should map values and keys based on values and keys',
+    );
 })();
 
 (function () {