diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index b36e8b1131c..ccf64beb58f 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -18,6 +18,9 @@ Yii Framework 2 Change Log
 - Bug #17181: Improved `BaseUrl::isRelative($url)` performance (sammousa, bizley, rob006)
 - Bug #17191: Fixed `BaseUrl::isRelative($url)` method in `yii\helpers\BaseUrl` (ggh2e3)
 - Bug #18469: Fixed `Link::serialize(array $links)` method in `yii\web\Link` (ggh2e3)
+- Bug #19691: Allow using custom class to style error summary (skepticspriggan)
+- Bug #20040: Fix type `boolean` in `MSSQL` (terabytesoftw)
+- Bug #20005: Fix `yii\console\controllers\ServeController` to specify the router script (terabytesoftw)
 - Bug #19060: Fix `yii\widgets\Menu` bug when using Closure for active item and adding additional tests in `tests\framework\widgets\MenuTest` (atrandafir)
 - Bug #19691: Allow using custom class to style error summary (skepticspriggan)
 - Bug #19817: Add MySQL Query `addCheck()` and `dropCheck()` (@bobonov)
diff --git a/framework/data/ActiveDataProvider.php b/framework/data/ActiveDataProvider.php
index 1a098cd6474..600e7f9e104 100644
--- a/framework/data/ActiveDataProvider.php
+++ b/framework/data/ActiveDataProvider.php
@@ -102,6 +102,7 @@ protected function prepareModels()
         }
         $query = clone $this->query;
         if (($pagination = $this->getPagination()) !== false) {
+            $pagination->totalCount = $this->getTotalCount();
             if ($pagination->totalCount === 0) {
                 return [];
             }
diff --git a/framework/data/ArrayDataProvider.php b/framework/data/ArrayDataProvider.php
index feddc16ab11..657bcd2a1c3 100644
--- a/framework/data/ArrayDataProvider.php
+++ b/framework/data/ArrayDataProvider.php
@@ -86,10 +86,14 @@ protected function prepareModels()
             $models = $this->sortModels($models, $sort);
         }
 
-        $pagination = $this->getPagination();
-        if ($pagination !== false && $pagination->getPageSize() > 0) {
-            $models = array_slice($models, $pagination->getOffset(), $pagination->getLimit(), true);
+        if (($pagination = $this->getPagination()) !== false) {
+            $pagination->totalCount = $this->getTotalCount();
+
+            if ($pagination->getPageSize() > 0) {
+                $models = array_slice($models, $pagination->getOffset(), $pagination->getLimit(), true);
+            }
         }
+
         return $models;
     }
 
diff --git a/framework/data/BaseDataProvider.php b/framework/data/BaseDataProvider.php
index 22fa1a0ad4f..944e4289c4a 100644
--- a/framework/data/BaseDataProvider.php
+++ b/framework/data/BaseDataProvider.php
@@ -164,13 +164,13 @@ public function getCount()
      */
     public function getTotalCount()
     {
-        if ($this->_pagination === false) {
+        if ($this->getPagination() === false) {
             return $this->getCount();
+        } elseif ($this->_totalCount === null) {
+            $this->_totalCount = $this->prepareTotalCount();
         }
-        if ($this->_totalCount !== null) {
-            return (int)$this->_totalCount;
-        }
-        return $this->prepareTotalCount();
+
+        return $this->_totalCount;
     }
 
     /**
@@ -193,6 +193,7 @@ public function getPagination()
         if ($this->_pagination === null) {
             $this->setPagination([]);
         }
+
         return $this->_pagination;
     }
 
@@ -216,15 +217,9 @@ public function setPagination($value)
                 $config['pageParam'] = $this->id . '-page';
                 $config['pageSizeParam'] = $this->id . '-per-page';
             }
-            $value = Yii::createObject(array_merge($config, $value));
-        }
-        if ($value instanceof Pagination) {
-            $value->setTotalCount(function () {
-                return $this->getTotalCount();
-            });
+            $this->_pagination = Yii::createObject(array_merge($config, $value));
+        } elseif ($value instanceof Pagination || $value === false) {
             $this->_pagination = $value;
-        } elseif ($value === false) {
-            $this->_pagination = false;
         } else {
             throw new InvalidArgumentException('Only Pagination instance, configuration array or false is allowed.');
         }
diff --git a/framework/data/SqlDataProvider.php b/framework/data/SqlDataProvider.php
index c173a23d973..3b612de5c70 100644
--- a/framework/data/SqlDataProvider.php
+++ b/framework/data/SqlDataProvider.php
@@ -126,6 +126,7 @@ protected function prepareModels()
         }
 
         if ($pagination !== false) {
+            $pagination->totalCount = $this->getTotalCount();
             $limit = $pagination->getLimit();
             $offset = $pagination->getOffset();
         }
diff --git a/tests/framework/data/ActiveDataProviderTest.php b/tests/framework/data/ActiveDataProviderTest.php
index da3e70df945..815002d9dbe 100644
--- a/tests/framework/data/ActiveDataProviderTest.php
+++ b/tests/framework/data/ActiveDataProviderTest.php
@@ -170,8 +170,9 @@ public function testPaginationBeforeModels()
             'query' => $query->from('order')->orderBy('id'),
         ]);
         $pagination = $provider->getPagination();
-        $this->assertEquals(1, $pagination->getPageCount());
+        $this->assertEquals(0, $pagination->getPageCount());
         $this->assertCount(3, $provider->getModels());
+        $this->assertEquals(1, $pagination->getPageCount());
 
         $provider->getPagination()->pageSize = 2;
         $this->assertCount(3, $provider->getModels());
diff --git a/tests/framework/rest/SerializerTest.php b/tests/framework/rest/SerializerTest.php
index f2e0ed72e5e..91b627b8f8e 100644
--- a/tests/framework/rest/SerializerTest.php
+++ b/tests/framework/rest/SerializerTest.php
@@ -439,30 +439,6 @@ public function testHeadSerializeDataProvider($dataProvider, $expectedResult, $s
         ]);
         $serializer->preserveKeys = $saveKeys;
         $this->assertEmpty($serializer->serialize($dataProvider));
-        $this->assertNotEmpty($serializer->response->getHeaders()->get($serializer->totalCountHeader));
-
-        $arrayDataProviderMock = $this->getMockBuilder(ArrayDataProvider::className())
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        // stub getModels to prevent empty
-        $arrayDataProviderMock
-            ->method('getModels')
-            ->willReturn($expectedResult);
-
-        // stub getPagination for header
-        $arrayDataProviderMock
-            ->method('getPagination')
-            ->willReturn($dataProvider->getPagination());
-
-        // assert normal HEAD is empty response
-        $this->assertEmpty($serializer->serialize($arrayDataProviderMock));
-
-        // Test #20002:  Set up the expectation for the getModels method
-        $arrayDataProviderMock->expects($this->never())
-            ->method('getModels');
-
-        // reset Method
         unset($_POST[$request->methodParam], $_SERVER['REQUEST_METHOD']);
     }