diff --git a/src/binary_stream.cpp b/src/binary_stream.cpp
index 047f858..906a2ef 100644
--- a/src/binary_stream.cpp
+++ b/src/binary_stream.cpp
@@ -270,7 +270,7 @@ void BinaryStreamWriter::wwstring(std::wstring s)
 {
     wu32(s.size());
     std::wstring_convert<std::codecvt_utf16<wchar_t, 0x10ffff>> converter;
-    wstring(converter.to_bytes(s));
+    wstring_raw(converter.to_bytes(s));
 }
 
 void BinaryStreamWriter::wwstring_raw(std::wstring s)
diff --git a/src/serializer.h b/src/serializer.h
index 85d2819..b787560 100644
--- a/src/serializer.h
+++ b/src/serializer.h
@@ -4,6 +4,18 @@
 #include "util.h"
 #include "log.h"
 
+template<typename T> BinaryStreamWriter& operator<<(BinaryStreamWriter& w, const T& obj)
+{
+    obj.write(w);
+    return w;
+}
+
+template<typename T> BinaryStreamReader& operator>>(BinaryStreamReader& r, const T& obj)
+{
+    obj.read(r);
+    return r;
+}
+
 class Serializer
 {
 public:
@@ -65,6 +77,8 @@ public:
     {
         using native_type = double;
         double value;
+        Double() = default;
+        Double(double value) : value(value) { }
         virtual std::string type_key() const override { return "doub"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -83,8 +97,16 @@ public:
     struct UnitFloat : public Type
     {
         using native_type = double;
+        static constexpr const char* UnitAngle   = "#Ang"; // angle: base degrees
+        static constexpr const char* UnitDensity = "#Rsl"; // density: base per inch
+        static constexpr const char* UnitDist    = "#Rlt"; // distance: base 72ppi
+        static constexpr const char* UnitNone    = "#Nne"; // none: coerced.
+        static constexpr const char* UnitPercent = "#Prc"; // percent: unit value
+        static constexpr const char* UnitPixel   = "#Pxl"; // pixels: tagged unit value
         std::string unit;
         double value;
+        UnitFloat() = default;
+        UnitFloat(const std::string& unit, double value) : unit(unit), value(value) { }
         virtual std::string type_key() const override { return "UntF"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -106,6 +128,9 @@ public:
     {
         using native_type = std::wstring;
         std::wstring value;
+        String() = default;
+        String(const std::wstring& s) : value(s) { }
+        String(const std::string& s) : value(str2wstr(s)) { }
         virtual std::string type_key() const override { return "TEXT"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -125,6 +150,8 @@ public:
     {
         std::string type;
         std::string value;
+        Enum() = default;
+        Enum(const std::string& type, const std::string& value) : type(type), value(value) { }
         virtual std::string type_key() const override { return "enum"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -146,6 +173,8 @@ public:
     {
         using native_type = int32_t;
         int32_t value;
+        Integer() = default;
+        Integer(int32_t value) : value(value) { }
         virtual std::string type_key() const override { return "long"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -165,6 +194,8 @@ public:
     {
         using native_type = bool;
         bool value;
+        Boolean() = default;
+        Boolean(bool value) : value(value) { }
         virtual std::string type_key() const override { return "bool"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -183,6 +214,9 @@ public:
     struct RawData : public Type
     {
         std::vector<uint8_t> data;
+        RawData() = default;
+        //RawData(const RawData&) = delete;
+        RawData(std::vector<uint8_t> data) : data(data) { }
         virtual std::string type_key() const override { return "tdta"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -203,6 +237,7 @@ public:
         std::wstring name;
         std::string class_id;
         Type::Map props;
+        Descriptor() = default;
         virtual std::string type_key() const override { return "Objc"; }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
@@ -275,6 +310,9 @@ public:
         uint32_t left;
         uint32_t bottom;
         uint32_t right;
+        Rectangle() = default;
+        Rectangle(uint32_t top, uint32_t left, uint32_t bottom, uint32_t right) :
+            top(top), left(left), bottom(bottom), right(right) { }
         uint32_t area() const { return (right - left) * (bottom - top); }
         uint32_t width() const { return right - left; }
         uint32_t height() const { return bottom - top; }
@@ -302,6 +340,8 @@ public:
     {
         uint32_t x;
         uint32_t y;
+        Point() = default;
+        Point(uint32_t x, uint32_t y) : x(x), y(y) { }
         virtual std::string str(int indent, const std::string& prefix) const override
         {
             return std::string(indent, '-') + prefix + fmt::format("point: [{}, {}]", x, y);
@@ -325,8 +365,8 @@ public:
         uint8_t compression;
         std::vector<uint8_t> data;
         Channel() = default;
-        //Channel(uint32_t depth, Rectangle rect, uint8_t compression, std::vector<uint8_t> data) :
-        //    depth(depth), rect(rect), compression(compression), data(std::move(data)) { } 
+        Channel(uint32_t depth, Rectangle rect, uint8_t compression, std::vector<uint8_t> data) :
+            depth(depth), rect(rect), compression(compression), data(std::move(data)) { } 
         virtual bool read(BinaryStreamReader& r) override
         {
             auto length = r.ru32(); // skip if 0, length is from the next field to the end
@@ -380,7 +420,7 @@ public:
         Rectangle rect;
         std::vector<Channel> channels;
         VMArray() = default;
-        //VMArray(uint32_t version, const Rectangle& rect) : version(version), rect(rect) { }
+        VMArray(uint32_t version, const Rectangle& rect) : version(version), rect(rect) { }
         std::shared_ptr<Image> image(bool grayscale, bool invert) const
         {
             int nc = channels.size();
@@ -465,6 +505,12 @@ public:
         {
         }
     };
+    template<typename T> static T parse(BinaryStreamReader& r)
+    {
+        T ret{};
+        ret.read(r);
+        return ret;
+    }
 protected:
     static Type::Ref instanciate(const std::string& key);
     static std::map<std::string /*key*/, std::function<Type::Ref()>> m_ctor_table;