diff --git a/src/Illuminate/Cache/RetrievesMultipleKeys.php b/src/Illuminate/Cache/RetrievesMultipleKeys.php
index 5dd41edb5e7f..7db7a0aa50af 100644
--- a/src/Illuminate/Cache/RetrievesMultipleKeys.php
+++ b/src/Illuminate/Cache/RetrievesMultipleKeys.php
@@ -16,8 +16,12 @@ public function many(array $keys)
     {
         $return = [];
 
-        foreach ($keys as $key) {
-            $return[$key] = $this->get($key);
+        $keys = collect($keys)->mapWithKeys(function ($value, $key) {
+            return [is_string($key) ? $key : $value => is_string($key) ? $value : null];
+        })->all();
+
+        foreach ($keys as $key => $default) {
+            $return[$key] = $this->get($key, $default);
         }
 
         return $return;
diff --git a/src/Illuminate/Cache/TaggedCache.php b/src/Illuminate/Cache/TaggedCache.php
index 01e483b6ea66..ae5ad8e3e07d 100644
--- a/src/Illuminate/Cache/TaggedCache.php
+++ b/src/Illuminate/Cache/TaggedCache.php
@@ -56,7 +56,7 @@ public function putMany(array $values, $ttl = null)
      */
     public function increment($key, $value = 1)
     {
-        $this->store->increment($this->itemKey($key), $value);
+        return $this->store->increment($this->itemKey($key), $value);
     }
 
     /**
@@ -68,7 +68,7 @@ public function increment($key, $value = 1)
      */
     public function decrement($key, $value = 1)
     {
-        $this->store->decrement($this->itemKey($key), $value);
+        return $this->store->decrement($this->itemKey($key), $value);
     }
 
     /**
diff --git a/tests/Cache/CacheTaggedCacheTest.php b/tests/Cache/CacheTaggedCacheTest.php
index 2fee3e8e84de..fca40fcf6cef 100644
--- a/tests/Cache/CacheTaggedCacheTest.php
+++ b/tests/Cache/CacheTaggedCacheTest.php
@@ -56,6 +56,131 @@ public function testTagsWithStringArgument()
         $this->assertSame('bar', $store->tags('bop')->get('foo'));
     }
 
+    public function testWithIncrement()
+    {
+        $store = new ArrayStore;
+        $taggableStore = $store->tags('bop');
+
+        $taggableStore->put('foo', 5, 10);
+
+        $value = $taggableStore->increment('foo');
+        $this->assertSame(6, $value);
+
+        $value = $taggableStore->increment('foo');
+        $this->assertSame(7, $value);
+
+        $value = $taggableStore->increment('foo', 3);
+        $this->assertSame(10, $value);
+
+        $value = $taggableStore->increment('foo', -2);
+        $this->assertSame(8, $value);
+
+        $value = $taggableStore->increment('x');
+        $this->assertSame(1, $value);
+
+        $value = $taggableStore->increment('y', 10);
+        $this->assertSame(10, $value);
+    }
+
+    public function testWithDecrement()
+    {
+        $store = new ArrayStore;
+        $taggableStore = $store->tags('bop');
+
+        $taggableStore->put('foo', 50, 10);
+
+        $value = $taggableStore->decrement('foo');
+        $this->assertSame(49, $value);
+
+        $value = $taggableStore->decrement('foo');
+        $this->assertSame(48, $value);
+
+        $value = $taggableStore->decrement('foo', 3);
+        $this->assertSame(45, $value);
+
+        $value = $taggableStore->decrement('foo', -2);
+        $this->assertSame(47, $value);
+
+        $value = $taggableStore->decrement('x');
+        $this->assertSame(-1, $value);
+
+        $value = $taggableStore->decrement('y', 10);
+        $this->assertSame(-10, $value);
+    }
+
+    public function testMany()
+    {
+        $store = $this->getTestCacheStoreWithTagValues();
+
+        $values = $store->tags(['fruit'])->many(['a', 'e', 'b', 'd', 'c']);
+        $this->assertSame([
+            'a' => 'apple',
+            'e' => null,
+            'b' => 'banana',
+            'd' => null,
+            'c' => 'orange',
+        ], $values);
+    }
+
+    public function testManyWithDefaultValues()
+    {
+        $store = $this->getTestCacheStoreWithTagValues();
+
+        $values = $store->tags(['fruit'])->many([
+            'a' => 147,
+            'e' => 547,
+            'b' => 'hello world!',
+            'x' => 'hello world!',
+            'd',
+            'c',
+        ]);
+        $this->assertSame([
+            'a' => 'apple',
+            'e' => 547,
+            'b' => 'banana',
+            'x' => 'hello world!',
+            'd' => null,
+            'c' => 'orange',
+        ], $values);
+    }
+
+    public function testGetMultiple()
+    {
+        $store = $this->getTestCacheStoreWithTagValues();
+
+        $values = $store->tags(['fruit'])->getMultiple(['a', 'e', 'b', 'd', 'c']);
+        $this->assertSame([
+            'a' => 'apple',
+            'e' => null,
+            'b' => 'banana',
+            'd' => null,
+            'c' => 'orange',
+        ], $values);
+
+        $values = $store->tags(['fruit', 'color'])->getMultiple(['a', 'e', 'b', 'd', 'c']);
+        $this->assertSame([
+            'a' => 'red',
+            'e' => 'blue',
+            'b' => null,
+            'd' => 'yellow',
+            'c' => null,
+        ], $values);
+    }
+
+    public function testGetMultipleWithDefaultValue()
+    {
+        $store = $this->getTestCacheStoreWithTagValues();
+
+        $values = $store->tags(['fruit', 'color'])->getMultiple(['a', 'e', 'b', 'd', 'c'], 547);
+        $this->assertSame([
+            'a' => 'red',
+            'e' => 'blue',
+            'b' => 547,
+            'd' => 'yellow',
+            'c' => 547,
+        ], $values);
+    }
+
     public function testTagsWithIncrementCanBeFlushed()
     {
         $store = new ArrayStore;
@@ -161,4 +286,30 @@ public function testRedisCacheTagsCanBeFlushed()
 
         $redis->flush();
     }
+
+    private function getTestCacheStoreWithTagValues(): ArrayStore
+    {
+        $store = new ArrayStore;
+
+        $tags = ['fruit'];
+        $store->tags($tags)->put('a', 'apple', 10);
+        $store->tags($tags)->put('b', 'banana', 10);
+        $store->tags($tags)->put('c', 'orange', 10);
+
+        $tags = ['fruit', 'color'];
+        $store->tags($tags)->putMany([
+            'a' => 'red',
+            'd' => 'yellow',
+            'e' => 'blue',
+        ], 10);
+
+        $tags = ['sizes', 'shirt'];
+        $store->tags($tags)->putMany([
+            'a' => 'small',
+            'b' => 'medium',
+            'c' => 'large',
+        ], 10);
+
+        return $store;
+    }
 }