diff --git a/td/generate/DoxygenTlDocumentationGenerator.php b/td/generate/DoxygenTlDocumentationGenerator.php
index 0a87e363c..641c1a125 100644
--- a/td/generate/DoxygenTlDocumentationGenerator.php
+++ b/td/generate/DoxygenTlDocumentationGenerator.php
@@ -10,15 +10,15 @@ class DoxygenTlDocumentationGenerator extends TlDocumentationGenerator
             case 'Bool':
                 return 'bool ';
             case 'int32':
-                return 'std::int32_t ';
+                return 'int32 ';
             case 'int53':
                 return 'int53 ';
             case 'int64':
-                return 'std::int64_t ';
+                return 'int64 ';
             case 'double':
                 return 'double ';
             case 'string':
-                return 'std::string const &';
+                return 'string const &';
             case 'bytes':
                 return 'bytes const &';
 
@@ -69,15 +69,15 @@ class DoxygenTlDocumentationGenerator extends TlDocumentationGenerator
             case 'Bool':
                 return 'bool';
             case 'int32':
-                return 'std::int32_t';
+                return 'int32';
             case 'int53':
                 return 'int53';
             case 'int64':
-                return 'std::int64_t';
+                return 'int64';
             case 'double':
                 return 'double';
             case 'string':
-                return 'std::string';
+                return 'string';
             case 'bytes':
                 return 'bytes';
             case 'bool':
@@ -167,6 +167,13 @@ class DoxygenTlDocumentationGenerator extends TlDocumentationGenerator
  * Contains declarations of all functions and types which represent a public TDLib interface.
  */
 EOT
+);
+
+        $this->addDocumentation('using int32 = std::int32_t;', <<<EOT
+/**
+ * This type is used to store 32-bit signed integers, which can be represented as Number in JSON.
+ */
+EOT
 );
 
         $this->addDocumentation('using int53 = std::int64_t;', <<<EOT
@@ -174,11 +181,25 @@ EOT
  * This type is used to store 53-bit signed integers, which can be represented as Number in JSON.
  */
 EOT
+);
+
+        $this->addDocumentation('using int64 = std::int64_t;', <<<EOT
+/**
+ * This type is used to store 64-bit signed integers, which can't be represented as Number in JSON and are represented as String instead.
+ */
+EOT
+);
+
+        $this->addDocumentation('using string = std::string;', <<<EOT
+/**
+ * This type is used to store UTF-8 strings.
+ */
+EOT
 );
 
         $this->addDocumentation('using bytes = std::string;', <<<EOT
 /**
- * This type is used to store arbitrary sequence of bytes.
+ * This type is used to store arbitrary sequences of bytes. In JSON interface the bytes are base64-encoded.
  */
 EOT
 );
diff --git a/td/generate/tl_writer_cpp.cpp b/td/generate/tl_writer_cpp.cpp
index abc468ff3..bfaeb2eb6 100644
--- a/td/generate/tl_writer_cpp.cpp
+++ b/td/generate/tl_writer_cpp.cpp
@@ -147,7 +147,7 @@ std::string TD_TL_writer_cpp::gen_fetch_class_name(const tl::tl_tree_type *tree_
     return "TlFetch" + name;
   }
   if (name == "String") {
-    return "TlFetchString<" + string_type + ">";
+    return "TlFetchString<string>";
   }
   if (name == "Bytes") {
     return "TlFetchBytes<bytes>";
diff --git a/td/generate/tl_writer_h.cpp b/td/generate/tl_writer_h.cpp
index 1716a2c1e..2404d7f6a 100644
--- a/td/generate/tl_writer_h.cpp
+++ b/td/generate/tl_writer_h.cpp
@@ -56,7 +56,13 @@ std::string TD_TL_writer_h::gen_output_begin() const {
          ext_forward_declaration + "namespace " + tl_name +
          " {\n\n"
 
-         "using int53 = std::int64_t;\n\n"
+         "using int32 = std::int32_t;\n"
+         "using int53 = std::int64_t;\n"
+         "using int64 = std::int64_t;\n\n"
+
+         "using string = " +
+         string_type +
+         ";\n\n"
 
          "using bytes = " +
          bytes_type +
diff --git a/td/generate/tl_writer_jni_cpp.cpp b/td/generate/tl_writer_jni_cpp.cpp
index c08efd2ec..4fe2300a2 100644
--- a/td/generate/tl_writer_jni_cpp.cpp
+++ b/td/generate/tl_writer_jni_cpp.cpp
@@ -83,10 +83,10 @@ std::string TD_TL_writer_jni_cpp::gen_vector_fetch(std::string field_name, const
 
   std::string fetch_object = "jni::fetch_object(env, p, " + field_name + "fieldID)";
   std::string array_type;
-  if (vector_type == "std::int32_t") {
+  if (vector_type == "int32") {
     array_type = "jintArray";
   }
-  if (vector_type == "int53" || vector_type == "std::int64_t") {
+  if (vector_type == "int53" || vector_type == "int64") {
     array_type = "jlongArray";
   }
   if (vector_type == "double") {
@@ -98,7 +98,7 @@ std::string TD_TL_writer_jni_cpp::gen_vector_fetch(std::string field_name, const
   }
 
   std::string template_type;
-  if (vector_type == string_type) {
+  if (vector_type == "string") {
     template_type = "std::string";
   } else if (vector_type.compare(0, 11, "std::vector") == 0) {
     const tl::tl_tree_type *child = static_cast<const tl::tl_tree_type *>(t->children[0]);
@@ -248,8 +248,8 @@ std::string TD_TL_writer_jni_cpp::gen_vector_store(const std::string &field_name
   if (vector_type == "bool") {
     assert(false);  // TODO
   }
-  if (vector_type == "std::int32_t" || vector_type == "int53" || vector_type == "std::int64_t" ||
-      vector_type == "double" || vector_type == string_type || vector_type.compare(0, 11, "std::vector") == 0 ||
+  if (vector_type == "int32" || vector_type == "int53" || vector_type == "int64" || vector_type == "double" ||
+      vector_type == "string" || vector_type.compare(0, 11, "std::vector") == 0 ||
       vector_type.compare(0, 10, "object_ptr") == 0) {
     return "{ "
            "auto arr_tmp_ = jni::store_vector(env, " +
diff --git a/td/generate/tl_writer_jni_h.cpp b/td/generate/tl_writer_jni_h.cpp
index d8722b96b..d050edae6 100644
--- a/td/generate/tl_writer_jni_h.cpp
+++ b/td/generate/tl_writer_jni_h.cpp
@@ -79,7 +79,13 @@ std::string TD_TL_writer_jni_h::gen_output_begin() const {
          tl_name +
          " {\n\n"
 
-         "using int53 = std::int64_t;\n\n"
+         "using int32 = std::int32_t;\n"
+         "using int53 = std::int64_t;\n"
+         "using int64 = std::int64_t;\n\n"
+
+         "using string = " +
+         string_type +
+         ";\n\n"
 
          "using bytes = " +
          bytes_type +
diff --git a/td/generate/tl_writer_td.cpp b/td/generate/tl_writer_td.cpp
index 6b5949a1b..1a9cdb431 100644
--- a/td/generate/tl_writer_td.cpp
+++ b/td/generate/tl_writer_td.cpp
@@ -121,7 +121,7 @@ std::string TD_TL_writer::gen_class_name(std::string name) const {
     assert(false);
   }
   if (name == "#") {
-    return "std::int32_t";
+    return "int32";
   }
   for (std::size_t i = 0; i < name.size(); i++) {
     if (!is_alnum(name[i])) {
@@ -161,7 +161,7 @@ std::string TD_TL_writer::gen_type_name(const tl::tl_tree_type *tree_type) const
   const std::string &name = t->name;
 
   if (name == "#") {
-    return "std::int32_t";
+    return "int32";
   }
   if (name == "True") {
     return "bool";
@@ -170,19 +170,19 @@ std::string TD_TL_writer::gen_type_name(const tl::tl_tree_type *tree_type) const
     return "bool";
   }
   if (name == "Int" || name == "Int32") {
-    return "std::int32_t";
+    return "int32";
   }
   if (name == "Int53") {
     return "int53";
   }
   if (name == "Long" || name == "Int64") {
-    return "std::int64_t";
+    return "int64";
   }
   if (name == "Double") {
     return "double";
   }
   if (name == "String") {
-    return string_type;
+    return "string";
   }
   if (name == "Int128") {
     return "UInt128";
@@ -242,10 +242,10 @@ std::string TD_TL_writer::gen_constructor_parameter(int field_num, const std::st
   }
 
   std::string res = (field_num == 0 ? "" : ", ");
-  if (field_type == "bool " || field_type == "std::int32_t " || field_type == "int53 " ||
-      field_type == "std::int64_t " || field_type == "double ") {
+  if (field_type == "bool " || field_type == "int32 " || field_type == "int53 " || field_type == "int64 " ||
+      field_type == "double ") {
     res += field_type;
-  } else if (field_type == "UInt128 " || field_type == "UInt256 " || field_type == string_type + " " ||
+  } else if (field_type == "UInt128 " || field_type == "UInt256 " || field_type == "string " ||
              (string_type == bytes_type && field_type == "bytes ")) {
     res += field_type + "const &";
   } else if (field_type.compare(0, 11, "std::vector") == 0 || field_type == "bytes ") {