diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba7d548..1f2b4f9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,8 +8,8 @@ set(META_APP_NAME "Tag Parser")
 set(META_APP_AUTHOR "Martchus")
 set(META_APP_URL "https://github.com/${META_APP_AUTHOR}/${META_PROJECT_NAME}")
 set(META_APP_DESCRIPTION "C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags")
-set(META_VERSION_MAJOR 9)
-set(META_VERSION_MINOR 4)
+set(META_VERSION_MAJOR 10)
+set(META_VERSION_MINOR 0)
 set(META_VERSION_PATCH 0)
 set(META_REQUIRED_CPP_UNIT_VERSION 1.14.0)
 set(META_ADD_DEFAULT_CPP_UNIT_TEST_APPLICATION ON)
diff --git a/aspectratio.h b/aspectratio.h
index a9bfce0..8b9d7af 100644
--- a/aspectratio.h
+++ b/aspectratio.h
@@ -11,9 +11,9 @@
 namespace TagParser {
 
 struct TAG_PARSER_EXPORT AspectRatio {
-    constexpr AspectRatio();
-    AspectRatio(std::uint8_t aspectRatioType);
-    constexpr AspectRatio(std::uint16_t numerator, std::uint16_t denominator);
+    constexpr explicit AspectRatio();
+    explicit AspectRatio(std::uint8_t aspectRatioType);
+    constexpr explicit AspectRatio(std::uint16_t numerator, std::uint16_t denominator);
     constexpr bool isValid() const;
     constexpr bool isExtended() const;
     std::string toString() const;
diff --git a/basicfileinfo.h b/basicfileinfo.h
index ed8dcff..6f69e56 100644
--- a/basicfileinfo.h
+++ b/basicfileinfo.h
@@ -14,7 +14,7 @@ namespace TagParser {
 class TAG_PARSER_EXPORT BasicFileInfo {
 public:
     // constructor, destructor
-    BasicFileInfo(const std::string &path = std::string());
+    explicit BasicFileInfo(const std::string &path = std::string());
     BasicFileInfo(const BasicFileInfo &) = delete;
     BasicFileInfo &operator=(const BasicFileInfo &) = delete;
     virtual ~BasicFileInfo();
diff --git a/id3/id3v1tag.cpp b/id3/id3v1tag.cpp
index 6344038..3111764 100644
--- a/id3/id3v1tag.cpp
+++ b/id3/id3v1tag.cpp
@@ -237,8 +237,8 @@ void Id3v1Tag::removeAllFields()
 unsigned int Id3v1Tag::fieldCount() const
 {
     unsigned int count = 0;
-    for (const auto &value : { m_title, m_artist, m_album, m_year, m_comment, m_trackPos, m_genre }) {
-        if (!value.isEmpty()) {
+    for (const auto &value : std::initializer_list<const TagValue *>{ &m_title, &m_artist, &m_album, &m_year, &m_comment, &m_trackPos, &m_genre }) {
+        if (!value->isEmpty()) {
             ++count;
         }
     }
diff --git a/id3/id3v2tag.cpp b/id3/id3v2tag.cpp
index 8577d64..a8c57ae 100644
--- a/id3/id3v2tag.cpp
+++ b/id3/id3v2tag.cpp
@@ -404,11 +404,11 @@ void Id3v2Tag::convertOldRecordDateFields(const std::string &diagContext, Diagno
 
     // set the field values as DateTime
     try {
-        setValue(Id3v2FrameIds::lRecordingTime, DateTime::fromDateAndTime(year, month, day, hour, minute));
+        setValue(Id3v2FrameIds::lRecordingTime, TagValue(DateTime::fromDateAndTime(year, month, day, hour, minute)));
     } catch (const ConversionException &e) {
         try {
             // try to set at least the year
-            setValue(Id3v2FrameIds::lRecordingTime, DateTime::fromDate(year));
+            setValue(Id3v2FrameIds::lRecordingTime, TagValue(DateTime::fromDate(year)));
             diag.emplace_back(DiagLevel::Critical,
                 argsToString(
                     "Unable to parse the full date of the recording. Only the 'Year' frame could be parsed; related frames failed: ", e.what()),
diff --git a/localeawarestring.h b/localeawarestring.h
index 650c4bb..3f23f0d 100644
--- a/localeawarestring.h
+++ b/localeawarestring.h
@@ -13,8 +13,8 @@ namespace TagParser {
  */
 class TAG_PARSER_EXPORT LocaleAwareString : public std::string {
 public:
-    LocaleAwareString(const std::string &value = std::string());
-    LocaleAwareString(std::string &&value);
+    explicit LocaleAwareString(const std::string &value = std::string());
+    explicit LocaleAwareString(std::string &&value);
     ~LocaleAwareString();
 
     const std::vector<std::string> &languages() const;
diff --git a/margin.h b/margin.h
index edbbad6..092e790 100644
--- a/margin.h
+++ b/margin.h
@@ -15,7 +15,7 @@ namespace TagParser {
  */
 class TAG_PARSER_EXPORT Margin {
 public:
-    constexpr Margin(std::uint32_t top = 0, std::uint32_t left = 0, std::uint32_t bottom = 0, std::uint32_t right = 0);
+    constexpr explicit Margin(std::uint32_t top = 0, std::uint32_t left = 0, std::uint32_t bottom = 0, std::uint32_t right = 0);
     constexpr std::uint32_t top() const;
     void setTop(std::uint32_t top);
     constexpr std::uint32_t left() const;
diff --git a/mediafileinfo.h b/mediafileinfo.h
index 2792a06..652ba4e 100644
--- a/mediafileinfo.h
+++ b/mediafileinfo.h
@@ -45,8 +45,8 @@ enum class ParsingStatus : std::uint8_t {
 class TAG_PARSER_EXPORT MediaFileInfo : public BasicFileInfo {
 public:
     // constructor, destructor
-    MediaFileInfo();
-    MediaFileInfo(const std::string &path);
+    explicit MediaFileInfo();
+    explicit MediaFileInfo(const std::string &path);
     MediaFileInfo(const MediaFileInfo &) = delete;
     MediaFileInfo &operator=(const MediaFileInfo &) = delete;
     ~MediaFileInfo() override;
diff --git a/positioninset.h b/positioninset.h
index c8353cf..8aaf4c9 100644
--- a/positioninset.h
+++ b/positioninset.h
@@ -20,7 +20,7 @@ namespace TagParser {
  */
 class TAG_PARSER_EXPORT PositionInSet {
 public:
-    constexpr PositionInSet(std::int32_t position = 0, std::int32_t total = 0);
+    constexpr explicit PositionInSet(std::int32_t position = 0, std::int32_t total = 0);
     template <typename StringType = std::string,
         CppUtilities::Traits::EnableIfAny<CppUtilities::Traits::IsSpecializationOf<StringType, std::basic_string>> * = nullptr>
     PositionInSet(const StringType &numericString);
diff --git a/progressfeedback.h b/progressfeedback.h
index 04a55d2..17a8226 100644
--- a/progressfeedback.h
+++ b/progressfeedback.h
@@ -14,8 +14,8 @@ template <typename ActualProgressFeedback> class BasicProgressFeedback {
 public:
     using Callback = std::function<void(ActualProgressFeedback &feedback)>;
 
-    BasicProgressFeedback(const Callback &callback, const Callback &percentageOnlyCallback = Callback());
-    BasicProgressFeedback(Callback &&callback, Callback &&percentageOnlyCallback = Callback());
+    explicit BasicProgressFeedback(const Callback &callback, const Callback &percentageOnlyCallback = Callback());
+    explicit BasicProgressFeedback(Callback &&callback, Callback &&percentageOnlyCallback = Callback());
 
     const std::string &step() const;
     std::uint8_t stepPercentage() const;
diff --git a/tagtarget.h b/tagtarget.h
index a91e82c..234474c 100644
--- a/tagtarget.h
+++ b/tagtarget.h
@@ -22,7 +22,7 @@ public:
     using IdType = std::uint64_t;
     using IdContainerType = std::vector<IdType>;
 
-    TagTarget(std::uint64_t level = 0, IdContainerType tracks = IdContainerType(), IdContainerType chapters = IdContainerType(),
+    explicit TagTarget(std::uint64_t level = 0, IdContainerType tracks = IdContainerType(), IdContainerType chapters = IdContainerType(),
         IdContainerType editions = IdContainerType(), IdContainerType attachments = IdContainerType());
 
     std::uint64_t level() const;
diff --git a/tagvalue.h b/tagvalue.h
index 24fcb36..0eb8789 100644
--- a/tagvalue.h
+++ b/tagvalue.h
@@ -75,19 +75,21 @@ enum class TagValueComparisionFlags : unsigned int {
 class TAG_PARSER_EXPORT TagValue {
 public:
     // constructor, destructor
-    TagValue();
-    TagValue(const char *text, std::size_t textSize, TagTextEncoding textEncoding = TagTextEncoding::Latin1,
+    explicit TagValue();
+    explicit TagValue(const char *text, std::size_t textSize, TagTextEncoding textEncoding = TagTextEncoding::Latin1,
         TagTextEncoding convertTo = TagTextEncoding::Unspecified);
-    TagValue(const char *text, TagTextEncoding textEncoding = TagTextEncoding::Latin1, TagTextEncoding convertTo = TagTextEncoding::Unspecified);
-    TagValue(
+    explicit TagValue(
+        const char *text, TagTextEncoding textEncoding = TagTextEncoding::Latin1, TagTextEncoding convertTo = TagTextEncoding::Unspecified);
+    explicit TagValue(
         const std::string &text, TagTextEncoding textEncoding = TagTextEncoding::Latin1, TagTextEncoding convertTo = TagTextEncoding::Unspecified);
-    TagValue(int value);
-    TagValue(const char *data, std::size_t length, TagDataType type = TagDataType::Undefined, TagTextEncoding encoding = TagTextEncoding::Latin1);
-    TagValue(std::unique_ptr<char[]> &&data, std::size_t length, TagDataType type = TagDataType::Binary,
+    explicit TagValue(int value);
+    explicit TagValue(
+        const char *data, std::size_t length, TagDataType type = TagDataType::Undefined, TagTextEncoding encoding = TagTextEncoding::Latin1);
+    explicit TagValue(std::unique_ptr<char[]> &&data, std::size_t length, TagDataType type = TagDataType::Binary,
         TagTextEncoding encoding = TagTextEncoding::Latin1);
-    TagValue(PositionInSet value);
-    TagValue(CppUtilities::DateTime value);
-    TagValue(CppUtilities::TimeSpan value);
+    explicit TagValue(PositionInSet value);
+    explicit TagValue(CppUtilities::DateTime value);
+    explicit TagValue(CppUtilities::TimeSpan value);
     TagValue(const TagValue &other);
     TagValue(TagValue &&other) = default;
     ~TagValue();