diff --git a/src/PhpSpreadsheet/Cell/Cell.php b/src/PhpSpreadsheet/Cell/Cell.php
index c0e864168..6a532892b 100644
--- a/src/PhpSpreadsheet/Cell/Cell.php
+++ b/src/PhpSpreadsheet/Cell/Cell.php
@@ -450,12 +450,9 @@ class Cell
      */
     public function setDataType($dataType): self
     {
-        if ($dataType == DataType::TYPE_STRING2) {
-            $dataType = DataType::TYPE_STRING;
-        }
-        $this->dataType = $dataType;
+        $this->setValueExplicit($this->value, $dataType);
 
-        return $this->updateInCollection();
+        return $this;
     }
 
     /**
diff --git a/src/PhpSpreadsheet/Reader/BaseReader.php b/src/PhpSpreadsheet/Reader/BaseReader.php
index 0779641ec..1b096f025 100644
--- a/src/PhpSpreadsheet/Reader/BaseReader.php
+++ b/src/PhpSpreadsheet/Reader/BaseReader.php
@@ -39,6 +39,7 @@ abstract class BaseReader implements IReader
     /**
      * Restrict which sheets should be loaded?
      * This property holds an array of worksheet names to be loaded. If null, then all worksheets will be loaded.
+     * This property is ignored for Csv, Html, and Slk.
      *
      * @var null|string[]
      */
@@ -200,4 +201,39 @@ abstract class BaseReader implements IReader
 
         $this->fileHandle = $fileHandle;
     }
+
+    /**
+     * Return worksheet info (Name, Last Column Letter, Last Column Index, Total Rows, Total Columns).
+     *
+     * @param string $filename
+     *
+     * @return array
+     */
+    public function listWorksheetInfo($filename)
+    {
+        throw new PhpSpreadsheetException('Reader classes must implement their own listWorksheetInfo() method');
+    }
+
+    /**
+     * Returns names of the worksheets from a file,
+     * possibly without parsing the whole file to a Spreadsheet object.
+     * Readers will often have a more efficient method with which
+     * they can override this method.
+     *
+     * @param string $filename
+     *
+     * @return array
+     */
+    public function listWorksheetNames($filename)
+    {
+        $returnArray = [];
+        $info = $this->listWorksheetInfo($filename);
+        foreach ($info as $infoArray) {
+            if (isset($infoArray['worksheetName'])) {
+                $returnArray[] = $infoArray['worksheetName'];
+            }
+        }
+
+        return $returnArray;
+    }
 }
diff --git a/src/PhpSpreadsheet/Reader/Csv.php b/src/PhpSpreadsheet/Reader/Csv.php
index 02134abfd..2b96a38af 100644
--- a/src/PhpSpreadsheet/Reader/Csv.php
+++ b/src/PhpSpreadsheet/Reader/Csv.php
@@ -10,6 +10,7 @@ use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
+use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class Csv extends BaseReader
 {
@@ -98,6 +99,9 @@ class Csv extends BaseReader
     /** @var bool */
     private $preserveNullString = false;
 
+    /** @var bool */
+    private $sheetNameIsFileName = false;
+
     /**
      * Create a new CSV Reader instance.
      */
@@ -212,8 +216,12 @@ class Csv extends BaseReader
 
     /**
      * Return worksheet info (Name, Last Column Letter, Last Column Index, Total Rows, Total Columns).
+     *
+     * @param string $filename
+     *
+     * @return array
      */
-    public function listWorksheetInfo(string $filename): array
+    public function listWorksheetInfo($filename)
     {
         // Open file
         $this->openFileOrMemory($filename);
@@ -373,6 +381,9 @@ class Csv extends BaseReader
             $spreadsheet->createSheet();
         }
         $sheet = $spreadsheet->setActiveSheetIndex($this->sheetIndex);
+        if ($this->sheetNameIsFileName) {
+            $sheet->setTitle(substr(basename($filename, '.csv'), 0, Worksheet::SHEET_TITLE_MAXIMUM_LENGTH));
+        }
 
         // Set our starting row based on whether we're in contiguous mode or not
         $currentRow = 1;
@@ -635,4 +646,11 @@ class Csv extends BaseReader
     {
         return $this->preserveNullString;
     }
+
+    public function setSheetNameIsFileName(bool $sheetNameIsFileName): self
+    {
+        $this->sheetNameIsFileName = $sheetNameIsFileName;
+
+        return $this;
+    }
 }
diff --git a/src/PhpSpreadsheet/Reader/Html.php b/src/PhpSpreadsheet/Reader/Html.php
index f4d91470a..386675d75 100644
--- a/src/PhpSpreadsheet/Reader/Html.php
+++ b/src/PhpSpreadsheet/Reader/Html.php
@@ -1164,4 +1164,29 @@ class Html extends BaseReader
             ],
         ]);
     }
+
+    /**
+     * Return worksheet info (Name, Last Column Letter, Last Column Index, Total Rows, Total Columns).
+     *
+     * @param string $filename
+     *
+     * @return array
+     */
+    public function listWorksheetInfo($filename)
+    {
+        $info = [];
+        $spreadsheet = new Spreadsheet();
+        $this->loadIntoExisting($filename, $spreadsheet);
+        foreach ($spreadsheet->getAllSheets() as $sheet) {
+            $newEntry = ['worksheetName' => $sheet->getTitle()];
+            $newEntry['lastColumnLetter'] = $sheet->getHighestDataColumn();
+            $newEntry['lastColumnIndex'] = Coordinate::columnIndexFromString($sheet->getHighestDataColumn()) - 1;
+            $newEntry['totalRows'] = $sheet->getHighestDataRow();
+            $newEntry['totalColumns'] = $newEntry['lastColumnIndex'] + 1;
+            $info[] = $newEntry;
+        }
+        $spreadsheet->disconnectWorksheets();
+
+        return $info;
+    }
 }
diff --git a/src/PhpSpreadsheet/Reader/Ods.php b/src/PhpSpreadsheet/Reader/Ods.php
index 095666ecd..719dd67ac 100644
--- a/src/PhpSpreadsheet/Reader/Ods.php
+++ b/src/PhpSpreadsheet/Reader/Ods.php
@@ -234,6 +234,7 @@ class Ods extends BaseReader
     {
         // Create new Spreadsheet
         $spreadsheet = new Spreadsheet();
+        $spreadsheet->removeSheetByIndex(0);
 
         // Load into this instance
         return $this->loadIntoExisting($filename, $spreadsheet);
@@ -335,9 +336,7 @@ class Ods extends BaseReader
                 $worksheetStyleName = $worksheetDataSet->getAttributeNS($tableNs, 'style-name');
 
                 // Create sheet
-                if ($worksheetID > 0) {
-                    $spreadsheet->createSheet(); // First sheet is added by default
-                }
+                $spreadsheet->createSheet();
                 $spreadsheet->setActiveSheetIndex($worksheetID);
 
                 if ($worksheetName || is_numeric($worksheetName)) {
diff --git a/src/PhpSpreadsheet/Reader/Slk.php b/src/PhpSpreadsheet/Reader/Slk.php
index be862008d..7170a2a91 100644
--- a/src/PhpSpreadsheet/Reader/Slk.php
+++ b/src/PhpSpreadsheet/Reader/Slk.php
@@ -165,7 +165,7 @@ class Slk extends BaseReader
 
                             break;
                         case 'Y':
-                            $rowIndex = substr($rowDatum, 1);
+                            $rowIndex = (int) substr($rowDatum, 1);
 
                             break;
                     }
diff --git a/src/PhpSpreadsheet/Reader/Xls.php b/src/PhpSpreadsheet/Reader/Xls.php
index 4eb96b4c2..a1ab019ac 100644
--- a/src/PhpSpreadsheet/Reader/Xls.php
+++ b/src/PhpSpreadsheet/Reader/Xls.php
@@ -416,6 +416,9 @@ class Xls extends BaseReader
      */
     private $baseCell;
 
+    /** @var bool */
+    private $activeSheetSet = false;
+
     /**
      * Create a new Xls Reader instance.
      */
@@ -820,6 +823,7 @@ class Xls extends BaseReader
         }
 
         // Parse the individual sheets
+        $this->activeSheetSet = false;
         foreach ($this->sheets as $sheet) {
             if ($sheet['sheetType'] != 0x00) {
                 // 0x00: Worksheet, 0x02: Chart, 0x06: Visual Basic module
@@ -1231,6 +1235,9 @@ class Xls extends BaseReader
                 }
             }
         }
+        if ($this->activeSheetSet === false) {
+            $this->spreadsheet->setActiveSheetIndex(0);
+        }
 
         // add the named ranges (defined names)
         foreach ($this->definedname as $definedName) {
@@ -4389,6 +4396,7 @@ class Xls extends BaseReader
         $isActive = (bool) ((0x0400 & $options) >> 10);
         if ($isActive) {
             $this->spreadsheet->setActiveSheetIndex($this->spreadsheet->getIndex($this->phpSheet));
+            $this->activeSheetSet = true;
         }
 
         // bit: 11; mask: 0x0800; 0 = normal view, 1 = page break view
diff --git a/src/PhpSpreadsheet/Reader/Xlsx/WorkbookView.php b/src/PhpSpreadsheet/Reader/Xlsx/WorkbookView.php
index 1b5fda1e5..3f7a4f857 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx/WorkbookView.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx/WorkbookView.php
@@ -19,9 +19,6 @@ class WorkbookView
      */
     public function viewSettings(SimpleXMLElement $xmlWorkbook, $mainNS, array $mapSheetId, bool $readDataOnly): void
     {
-        if ($this->spreadsheet->getSheetCount() == 0) {
-            $this->spreadsheet->createSheet();
-        }
         // Default active sheet index to the first loaded worksheet from the file
         $this->spreadsheet->setActiveSheetIndex(0);
 
diff --git a/tests/PhpSpreadsheetTests/Cell/DataType2Test.php b/tests/PhpSpreadsheetTests/Cell/DataType2Test.php
new file mode 100644
index 000000000..29c614735
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Cell/DataType2Test.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Cell;
+
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class DataType2Test extends TestCase
+{
+    public function testSetDataType(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->getCell('A1')->setValue(28.1);
+        self::assertSame(28.1, $sheet->getCell('A1')->getValue());
+        self::assertSame('28.1', (string) $sheet->getCell('A1'));
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_STRING);
+        self::assertSame('28.1', $sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_NUMERIC);
+        self::assertSame(28.1, $sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_STRING2);
+        self::assertSame('28.1', $sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_INLINE);
+        self::assertSame('28.1', $sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_BOOL);
+        self::assertTrue($sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_NUMERIC);
+        self::assertSame(1, $sheet->getCell('A1')->getValue());
+
+        $sheet->getCell('A2')->setValue('X');
+
+        try {
+            $sheet->getCell('A2')->setDataType(DataType::TYPE_NUMERIC);
+        } catch (PhpSpreadsheetException $e) {
+            self::assertSame('Invalid numeric value for datatype Numeric', $e->getMessage());
+        }
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/BaseNoLoad.php b/tests/PhpSpreadsheetTests/Reader/BaseNoLoad.php
index 9655dc596..1673f2c95 100644
--- a/tests/PhpSpreadsheetTests/Reader/BaseNoLoad.php
+++ b/tests/PhpSpreadsheetTests/Reader/BaseNoLoad.php
@@ -12,9 +12,4 @@ class BaseNoLoad extends BaseReader
     {
         return $filename !== '';
     }
-
-    public function loadxxx(string $filename): void
-    {
-        $this->loadSpreadsheetFromFile($filename);
-    }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/BaseNoLoadTest.php b/tests/PhpSpreadsheetTests/Reader/BaseNoLoadTest.php
index 473aa6d66..6943e8cd1 100644
--- a/tests/PhpSpreadsheetTests/Reader/BaseNoLoadTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/BaseNoLoadTest.php
@@ -14,6 +14,14 @@ class BaseNoLoadTest extends TestCase
         $this->expectException(SpreadsheetException::class);
         $this->expectExceptionMessage('Reader classes must implement their own loadSpreadsheetFromFile() method');
         $reader = new BaseNoLoad();
-        $reader->loadxxx('unknown.file');
+        $reader->load('unknown.file');
+    }
+
+    public function testBaseNoLoadInfo(): void
+    {
+        $this->expectException(SpreadsheetException::class);
+        $this->expectExceptionMessage('Reader classes must implement their own listWorksheetInfo() method');
+        $reader = new BaseNoLoad();
+        $reader->listWorksheetInfo('unknown.file');
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Csv/CsvCallbackTest.php b/tests/PhpSpreadsheetTests/Reader/Csv/CsvCallbackTest.php
index 6c28cb71e..753ddfec3 100644
--- a/tests/PhpSpreadsheetTests/Reader/Csv/CsvCallbackTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Csv/CsvCallbackTest.php
@@ -29,12 +29,14 @@ class CsvCallbackTest extends TestCase
         $spreadsheet = $reader->load($filename);
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('Å', $sheet->getCell('A1')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function callbackSetFallbackEncoding(Csv $reader): void
     {
         $reader->setFallbackEncoding('ISO-8859-2');
         $reader->setInputEncoding(Csv::GUESS_ENCODING);
+        $reader->setSheetNameIsFileName(true);
         $reader->setEscapeCharacter('');
     }
 
@@ -47,6 +49,7 @@ class CsvCallbackTest extends TestCase
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('premičre', $sheet->getCell('A1')->getValue());
         self::assertEquals('sixičme', $sheet->getCell('C2')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function testIOFactory(): void
@@ -57,6 +60,7 @@ class CsvCallbackTest extends TestCase
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('premičre', $sheet->getCell('A1')->getValue());
         self::assertEquals('sixičme', $sheet->getCell('C2')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function testNonFallbackEncoding(): void
@@ -68,6 +72,7 @@ class CsvCallbackTest extends TestCase
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('première', $sheet->getCell('A1')->getValue());
         self::assertEquals('sixième', $sheet->getCell('C2')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function testDefaultEscape(): void
@@ -78,6 +83,7 @@ class CsvCallbackTest extends TestCase
         $sheet = $spreadsheet->getActiveSheet();
         // this is not how Excel views the file
         self::assertEquals('a\"hello', $sheet->getCell('A1')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function testBetterEscape(): void
@@ -88,5 +94,7 @@ class CsvCallbackTest extends TestCase
         $sheet = $spreadsheet->getActiveSheet();
         // this is how Excel views the file
         self::assertEquals('a\"hello;hello;hello;\"', $sheet->getCell('A1')->getValue());
+        self::assertSame('escape', $sheet->getTitle(), 'callback set sheet title to use file name rather than default');
+        $spreadsheet->disconnectWorksheets();
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Csv/CsvEncodingTest.php b/tests/PhpSpreadsheetTests/Reader/Csv/CsvEncodingTest.php
index 2aeffa354..7ce3c5f4f 100644
--- a/tests/PhpSpreadsheetTests/Reader/Csv/CsvEncodingTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Csv/CsvEncodingTest.php
@@ -29,11 +29,13 @@ class CsvEncodingTest extends TestCase
         $reader = new Csv();
         $reader->setInputEncoding($encoding);
         $info = $reader->listWorksheetInfo($filename);
-        self::assertEquals('Worksheet', $info[0]['worksheetName']);
-        self::assertEquals('B', $info[0]['lastColumnLetter']);
-        self::assertEquals(1, $info[0]['lastColumnIndex']);
-        self::assertEquals(2, $info[0]['totalRows']);
-        self::assertEquals(2, $info[0]['totalColumns']);
+        self::assertCount(1, $info);
+        self::assertSame('Worksheet', $info[0]['worksheetName']);
+        self::assertSame('B', $info[0]['lastColumnLetter']);
+        self::assertSame(1, $info[0]['lastColumnIndex']);
+        self::assertSame(2, $info[0]['totalRows']);
+        self::assertSame(2, $info[0]['totalColumns']);
+        self::assertSame(['Worksheet'], $reader->listWorksheetNames($filename));
     }
 
     public static function providerEncodings(): array
@@ -74,6 +76,9 @@ class CsvEncodingTest extends TestCase
         $filename = 'tests/data/Reader/CSV/premiere.utf16le.csv';
         $reader = new Csv();
         $reader->setInputEncoding(Csv::guessEncoding($filename));
+        $names = $reader->listWorksheetNames($filename);
+        // Following ignored, just make sure it's executable.
+        $reader->setLoadSheetsOnly([$names[0]]);
         $spreadsheet = $reader->load($filename);
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('𐐀', $sheet->getCell('A3')->getValue());
diff --git a/tests/PhpSpreadsheetTests/Reader/Gnumeric/GnumericLoadTest.php b/tests/PhpSpreadsheetTests/Reader/Gnumeric/GnumericLoadTest.php
index e5e3a57e3..1d8d0060d 100644
--- a/tests/PhpSpreadsheetTests/Reader/Gnumeric/GnumericLoadTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Gnumeric/GnumericLoadTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace PhpOffice\PhpSpreadsheetTests\Reader\Gnumeric;
 
 use DateTimeZone;
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
 use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;
 use PhpOffice\PhpSpreadsheet\Reader\Gnumeric;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
@@ -172,6 +173,16 @@ class GnumericLoadTest extends TestCase
         $spreadsheet->disconnectWorksheets();
     }
 
+    public function testLoadNoSelectedSheets(): void
+    {
+        $this->expectException(PhpSpreadsheetException::class);
+        $this->expectExceptionMessage('You tried to set a sheet active by the out of bounds index');
+        $filename = 'samples/templates/GnumericTest.gnumeric';
+        $reader = new Gnumeric();
+        $reader->setLoadSheetsOnly(['Unknown Sheet', 'xReport Data']);
+        $reader->load($filename);
+    }
+
     public function testLoadNotGnumeric(): void
     {
         $this->expectException(ReaderException::class);
diff --git a/tests/PhpSpreadsheetTests/Reader/Html/Issue2942Test.php b/tests/PhpSpreadsheetTests/Reader/Html/Issue2942Test.php
index 4b253c7ac..5fbb6248b 100644
--- a/tests/PhpSpreadsheetTests/Reader/Html/Issue2942Test.php
+++ b/tests/PhpSpreadsheetTests/Reader/Html/Issue2942Test.php
@@ -16,6 +16,7 @@ class Issue2942Test extends TestCase
         $spreadsheet = $reader->loadFromString($content);
         $sheet = $spreadsheet->getActiveSheet();
         self::assertSame('éàâèî', $sheet->getCell('A1')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 
     public function testLoadFromFile(): void
@@ -34,5 +35,30 @@ class Issue2942Test extends TestCase
         self::assertSame('അആ', $sheet->getCell('B3')->getValue());
         self::assertSame('กขฃ', $sheet->getCell('C3')->getValue());
         self::assertSame('✀✐✠', $sheet->getCell('D3')->getValue());
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testInfo(): void
+    {
+        $file = 'tests/data/Reader/HTML/utf8chars.charset.html';
+        $reader = new Html();
+        $info = $reader->listWorksheetInfo($file);
+        self::assertCount(1, $info);
+        $info0 = $info[0];
+        self::assertSame('Test Utf-8 characters voilà', $info0['worksheetName']);
+        self::assertSame('D', $info0['lastColumnLetter']);
+        self::assertSame(3, $info0['lastColumnIndex']);
+        self::assertSame(7, $info0['totalRows']);
+        self::assertSame(4, $info0['totalColumns']);
+        $names = $reader->listWorksheetNames($file);
+        self::assertCount(1, $names);
+        self::assertSame('Test Utf-8 characters voilà', $names[0]);
+
+        // Following ignored, just make sure it's executable.
+        $reader->setLoadSheetsOnly([$names[0]]);
+        $spreadsheet = $reader->load($file);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame('✀✐✠', $sheet->getCell('D3')->getValue());
+        $spreadsheet->disconnectWorksheets();
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Ods/OdsTest.php b/tests/PhpSpreadsheetTests/Reader/Ods/OdsTest.php
index c26f99d50..fd17ae037 100644
--- a/tests/PhpSpreadsheetTests/Reader/Ods/OdsTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Ods/OdsTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
 
 use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
 use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;
 use PhpOffice\PhpSpreadsheet\Reader\Ods;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
@@ -71,7 +72,9 @@ class OdsTest extends TestCase
     public function testLoadOneWorksheet(): void
     {
         $reader = new Ods();
-        $reader->setLoadSheetsOnly(['Sheet1']);
+        //$reader->setLoadSheetsOnly(['Sheet1']);
+        $names = $reader->listWorksheetNames(self::ODS_DATA_FILE);
+        $reader->setLoadSheetsOnly([$names[0]]);
         $spreadsheet = $reader->load(self::ODS_DATA_FILE);
 
         self::assertEquals(1, $spreadsheet->getSheetCount());
@@ -92,6 +95,15 @@ class OdsTest extends TestCase
         $spreadsheet->disconnectWorksheets();
     }
 
+    public function testLoadNoSelectedWorksheet(): void
+    {
+        $this->expectException(PhpSpreadsheetException::class);
+        $this->expectExceptionMessage('You tried to set a sheet active by the out of bounds index');
+        $reader = new Ods();
+        $reader->setLoadSheetsOnly(['xSecond Sheet']);
+        $reader->load(self::ODS_DATA_FILE);
+    }
+
     public function testLoadBadFile(): void
     {
         $this->expectException(ReaderException::class);
diff --git a/tests/PhpSpreadsheetTests/Reader/Slk/SlkTest.php b/tests/PhpSpreadsheetTests/Reader/Slk/SlkTest.php
index c6820a873..ac8b381df 100644
--- a/tests/PhpSpreadsheetTests/Reader/Slk/SlkTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Slk/SlkTest.php
@@ -35,12 +35,14 @@ class SlkTest extends \PHPUnit\Framework\TestCase
     {
         $reader = new Slk();
         $workSheetInfo = $reader->listWorkSheetInfo(self::$testbook);
+        self::assertCount(1, $workSheetInfo);
         $info0 = $workSheetInfo[0];
-        self::assertEquals('SylkTest', $info0['worksheetName']);
-        self::assertEquals('J', $info0['lastColumnLetter']);
-        self::assertEquals(9, $info0['lastColumnIndex']);
-        self::assertEquals(18, $info0['totalRows']);
-        self::assertEquals(10, $info0['totalColumns']);
+        self::assertSame('SylkTest', $info0['worksheetName']);
+        self::assertSame('J', $info0['lastColumnLetter']);
+        self::assertSame(9, $info0['lastColumnIndex']);
+        self::assertSame(18, $info0['totalRows']);
+        self::assertSame(10, $info0['totalColumns']);
+        self::assertSame(['SylkTest'], $reader->listWorksheetNames(self::$testbook));
     }
 
     public function testBadFileName(): void
@@ -160,6 +162,9 @@ class SlkTest extends \PHPUnit\Framework\TestCase
             . '/123456789a123456789b123456789c12345.slk';
         file_put_contents($this->filename, $contents);
         $reader = new Slk();
+        $names = $reader->listWorksheetNames($this->filename);
+        // Following ignored, just make sure it's executable.
+        $reader->setLoadSheetsOnly([$names[0]]);
         $spreadsheet = $reader->load($this->filename);
         $sheet = $spreadsheet->getActiveSheet();
         self::assertEquals('123456789a123456789b123456789c1', $sheet->getTitle());
diff --git a/tests/PhpSpreadsheetTests/Reader/Xls/LoadSheetsOnlyTest.php b/tests/PhpSpreadsheetTests/Reader/Xls/LoadSheetsOnlyTest.php
new file mode 100644
index 000000000..e723dbda2
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xls/LoadSheetsOnlyTest.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xls;
+
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
+use PhpOffice\PhpSpreadsheet\Reader\Xls;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class LoadSheetsOnlyTest extends TestCase
+{
+    /** @var ?Spreadsheet */
+    private $spreadsheet;
+
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLS/HiddenSheet.xls';
+
+    protected function tearDown(): void
+    {
+        if ($this->spreadsheet !== null) {
+            $this->spreadsheet->disconnectWorksheets();
+            $this->spreadsheet = null;
+        }
+    }
+
+    public function testLoadSheet1Only(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xls();
+        //$reader->setLoadSheetsOnly(['Sheet1']);
+        $names = $reader->listWorksheetNames($filename);
+        $reader->setLoadSheetsOnly([$names[0]]);
+        $this->spreadsheet = $reader->load($filename);
+        self::assertSame(1, $this->spreadsheet->getSheetCount());
+        self::assertSame('Sheet1', $this->spreadsheet->getActiveSheet()->getTitle());
+    }
+
+    public function testLoadSheet2Only(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xls();
+        $reader->setLoadSheetsOnly(['Sheet2']);
+        $this->spreadsheet = $reader->load($filename);
+        self::assertSame(1, $this->spreadsheet->getSheetCount());
+        self::assertSame('Sheet2', $this->spreadsheet->getActiveSheet()->getTitle());
+    }
+
+    public function testLoadNoSheet(): void
+    {
+        $this->expectException(PhpSpreadsheetException::class);
+        $this->expectExceptionMessage('You tried to set a sheet active by the out of bounds index');
+        $filename = self::$testbook;
+        $reader = new Xls();
+        $reader->setLoadSheetsOnly(['Sheet3']);
+        $reader->load($filename);
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Xlsx/LoadSheetsOnlyTest.php b/tests/PhpSpreadsheetTests/Reader/Xlsx/LoadSheetsOnlyTest.php
new file mode 100644
index 000000000..3513fd981
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xlsx/LoadSheetsOnlyTest.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class LoadSheetsOnlyTest extends TestCase
+{
+    /** @var ?Spreadsheet */
+    private $spreadsheet;
+
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLSX/HiddenSheet.xlsx';
+
+    protected function tearDown(): void
+    {
+        if ($this->spreadsheet !== null) {
+            $this->spreadsheet->disconnectWorksheets();
+            $this->spreadsheet = null;
+        }
+    }
+
+    public function testLoadSheet1Only(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        //$reader->setLoadSheetsOnly(['Sheet1']);
+        $names = $reader->listWorksheetNames($filename);
+        $reader->setLoadSheetsOnly([$names[0]]);
+        $this->spreadsheet = $reader->load($filename);
+        self::assertSame(1, $this->spreadsheet->getSheetCount());
+        self::assertSame('Sheet1', $this->spreadsheet->getActiveSheet()->getTitle());
+    }
+
+    public function testLoadSheet2Only(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        $reader->setLoadSheetsOnly(['Sheet2']);
+        $this->spreadsheet = $reader->load($filename);
+        self::assertSame(1, $this->spreadsheet->getSheetCount());
+        self::assertSame('Sheet2', $this->spreadsheet->getActiveSheet()->getTitle());
+    }
+
+    public function testLoadNoSheet(): void
+    {
+        $this->expectException(PhpSpreadsheetException::class);
+        $this->expectExceptionMessage('You tried to set a sheet active by the out of bounds index');
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        $reader->setLoadSheetsOnly(['Sheet3']);
+        $reader->load($filename);
+    }
+
+    public function testLoadMultipleSheets(): void
+    {
+        $filename = 'tests/data/Reader/XLSX/threesheets.xlsx';
+        $reader = new Xlsx();
+        $reader->setLoadSheetsOnly(['Sheet3', 'Sheet1']);
+        $spreadsheet = $this->spreadsheet = $reader->load($filename);
+        self::assertSame(2, $spreadsheet->getSheetCount());
+        $sheet = $spreadsheet->getSheetByNameOrThrow('Sheet1');
+        self::assertSame('First', $sheet->getCell('A1')->getValue());
+        $sheet = $spreadsheet->getSheetByNameOrThrow('Sheet3');
+        self::assertSame('Third', $sheet->getCell('A1')->getValue());
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php b/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
index 821533aae..befac3b9e 100644
--- a/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace PhpOffice\PhpSpreadsheetTests\Reader\Xml;
 
 use DateTimeZone;
+use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
 use PhpOffice\PhpSpreadsheet\Reader\Xml;
 use PhpOffice\PhpSpreadsheet\Settings;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
@@ -128,6 +129,18 @@ class XmlLoadTest extends TestCase
         self::assertEquals('Third Heading', $sheet->getCell('C2')->getValue());
     }
 
+    public function testLoadNoSelectedSheets(): void
+    {
+        $this->expectException(PhpSpreadsheetException::class);
+        $this->expectExceptionMessage('You tried to set a sheet active by the out of bounds index');
+        $filename = __DIR__
+            . '/../../../..'
+            . '/samples/templates/excel2003.xml';
+        $reader = new Xml();
+        $reader->setLoadSheetsOnly(['Unknown Sheet', 'xReport Data']);
+        $this->spreadsheet = $reader->load($filename);
+    }
+
     public function testLoadUnusableSample(): void
     {
         // Sample spreadsheet is not readable by Excel.
diff --git a/tests/PhpSpreadsheetTests/Writer/Xlsx/Issue3711Test.php b/tests/PhpSpreadsheetTests/Writer/Xlsx/Issue3711Test.php
new file mode 100644
index 000000000..b454a4724
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Xlsx/Issue3711Test.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class Issue3711Test extends AbstractFunctional
+{
+    public function testIssue3711(): void
+    {
+        // Issue 3711 - float being used as index in StringTable.
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->getCell('A1')->setValue('21.5');
+        self::assertSame(21.5, $sheet->getCell('A1')->getValue());
+        $sheet->getCell('A1')->setDataType(DataType::TYPE_STRING);
+        $sheet->getCell('A2')->setValue('21');
+        self::assertSame(21, $sheet->getCell('A2')->getValue());
+        $sheet->getCell('A2')->setDataType(DataType::TYPE_STRING);
+
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx');
+        $spreadsheet->disconnectWorksheets();
+        $rsheet = $reloadedSpreadsheet->getActiveSheet();
+        self::assertSame('21.5', $rsheet->getCell('A1')->getValue());
+        self::assertSame('21', $rsheet->getCell('A2')->getValue());
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/HTML/utf8chars.charset.html b/tests/data/Reader/HTML/utf8chars.charset.html
new file mode 100644
index 000000000..e180dfd7c
--- /dev/null
+++ b/tests/data/Reader/HTML/utf8chars.charset.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset='UTF-8'>
+<title>Test Utf-8 characters voilà</title>
+</head>
+<body>
+<table>
+    <tbody>
+    <tr>
+        <td>éàâèî</td><!-- Latin1 -->
+        <td>αβγδε</td><!-- Greek -->
+    </tr>
+    <tr>
+        <td>𐐁𐐂𐐃 &amp; だけち</td><!-- Osmanya (not in BMP) and Hiragana -->
+        <td>אבגדה</td><!-- Hebrew -->
+        <td>𪔀𪔁𪔂</td><!-- CJK Unified Ideographs Extension B (not in BMP) -->
+    </tr>
+    <tr>
+        <td>᠐᠑᠒</td><!-- Mongolian -->
+        <td>അആ</td><!-- Malayalam -->
+        <td>กขฃ</td><!-- Thai -->
+        <td>✀✐✠</td><!-- Dingbats -->
+    </tr>
+    </tbody>
+</table>
+<table>
+    <tbody>
+    <tr>
+        <td>second table</td>
+    </tr>
+    </tbody>
+</table>
+<table>
+    <tbody>
+    <tr>
+        <td>third table</td>
+        <td>second cell</td>
+    </tr>
+    </tbody>
+</table>
+</body>
+</html>
diff --git a/tests/data/Reader/XLSX/threesheets.xlsx b/tests/data/Reader/XLSX/threesheets.xlsx
new file mode 100644
index 000000000..de30d849e
Binary files /dev/null and b/tests/data/Reader/XLSX/threesheets.xlsx differ