diff --git a/include/ArduinoJson/Arduino/String.hpp b/include/ArduinoJson/Arduino/String.hpp
index 206750bf..d4384f4d 100644
--- a/include/ArduinoJson/Arduino/String.hpp
+++ b/include/ArduinoJson/Arduino/String.hpp
@@ -15,13 +15,7 @@ class String : public std::string {
  public:
   String(const char *cstr = "") : std::string(cstr) {}
   String(const String &str) : std::string(str) {}
-  explicit String(char c);
-  explicit String(unsigned char);
-  explicit String(int);
-  explicit String(unsigned int);
   explicit String(long);
-  explicit String(unsigned long);
-  explicit String(float, unsigned char decimalPlaces = 2);
   explicit String(double, unsigned char decimalPlaces = 2);
 };
 
diff --git a/include/ArduinoJson/Internals/DynamicStringBuilder.hpp b/include/ArduinoJson/Internals/DynamicStringBuilder.hpp
index 0a4946e0..255b6671 100644
--- a/include/ArduinoJson/Internals/DynamicStringBuilder.hpp
+++ b/include/ArduinoJson/Internals/DynamicStringBuilder.hpp
@@ -23,6 +23,8 @@ class DynamicStringBuilder : public Print {
   }
 
  private:
+  DynamicStringBuilder &operator=(const DynamicStringBuilder &);
+
   String &_str;
 };
 }
diff --git a/include/ArduinoJson/Internals/JsonWriter.hpp b/include/ArduinoJson/Internals/JsonWriter.hpp
index b14bfe8f..eda0039a 100644
--- a/include/ArduinoJson/Internals/JsonWriter.hpp
+++ b/include/ArduinoJson/Internals/JsonWriter.hpp
@@ -8,6 +8,7 @@
 
 #include "../Arduino/Print.hpp"
 #include "Encoding.hpp"
+#include "ForceInline.hpp"
 
 namespace ArduinoJson {
 namespace Internals {
@@ -69,7 +70,7 @@ class JsonWriter {
 
  protected:
   void write(char c) { _length += _sink.write(c); }
-  void write(const char *s) { _length += _sink.print(s); }
+  FORCE_INLINE void write(const char *s) { _length += _sink.print(s); }
 
   Print &_sink;
   size_t _length;
diff --git a/include/ArduinoJson/JsonArraySubscript.hpp b/include/ArduinoJson/JsonArraySubscript.hpp
index 37f91ea6..64eb4368 100644
--- a/include/ArduinoJson/JsonArraySubscript.hpp
+++ b/include/ArduinoJson/JsonArraySubscript.hpp
@@ -16,13 +16,6 @@ class JsonArraySubscript : public JsonSubscriptBase<JsonArraySubscript> {
 
   using JsonSubscriptBase::operator=;
 
-  FORCE_INLINE JsonArraySubscript& operator=(const JsonArraySubscript& other) {
-    // to prevent Visual Studio warning C4512: assignment operator could not be
-    // generated
-    _array.set(_index, other._array.get(other._index));
-    return *this;
-  }
-
   FORCE_INLINE bool success() const { return _index < _array.size(); }
 
   FORCE_INLINE operator JsonVariant() const { return _array.get(_index); }
diff --git a/include/ArduinoJson/JsonObjectSubscript.hpp b/include/ArduinoJson/JsonObjectSubscript.hpp
index aaf1e035..65435e84 100644
--- a/include/ArduinoJson/JsonObjectSubscript.hpp
+++ b/include/ArduinoJson/JsonObjectSubscript.hpp
@@ -19,13 +19,6 @@ class JsonObjectSubscript
 
   using JsonSubscriptBase<JsonObjectSubscript<TKey> >::operator=;
 
-  FORCE_INLINE JsonObjectSubscript<TKey>& operator=(
-      const JsonObjectSubscript<TKey>& other) {
-    // to prevent Visual Studio warning C4512: assignment operator could not be
-    // generated
-    return set(other.get());
-  }
-
   FORCE_INLINE bool success() const { return _object.containsKey(_key); }
 
   FORCE_INLINE operator JsonVariant() const { return _object.get(_key); }
diff --git a/include/ArduinoJson/JsonVariant.ipp b/include/ArduinoJson/JsonVariant.ipp
index ae81a720..dc40965b 100644
--- a/include/ArduinoJson/JsonVariant.ipp
+++ b/include/ArduinoJson/JsonVariant.ipp
@@ -101,7 +101,7 @@ const char *JsonVariant::as<const char *>() const;
 
 template <>
 inline bool JsonVariant::as<bool>() const {
-  return as<long>();
+  return as<long>() != 0;
 }
 
 template <>
diff --git a/src/Arduino/String.cpp b/src/Arduino/String.cpp
index 1f851fac..b2a1b59f 100644
--- a/src/Arduino/String.cpp
+++ b/src/Arduino/String.cpp
@@ -16,12 +16,6 @@ String::String(double value, unsigned char digits) {
   *this = tmp;
 }
 
-String::String(int value) {
-  char tmp[32];
-  sprintf(tmp, "%d", value);
-  *this = tmp;
-}
-
 String::String(long value) {
   char tmp[32];
   sprintf(tmp, "%ld", value);
diff --git a/src/JsonVariant.cpp b/src/JsonVariant.cpp
index c3251912..52f609c9 100644
--- a/src/JsonVariant.cpp
+++ b/src/JsonVariant.cpp
@@ -99,19 +99,25 @@ bool JsonVariant::is<double>() const {
 }
 
 void JsonVariant::writeTo(JsonWriter &writer) const {
-  if (_type == JSON_ARRAY) _content.asArray->writeTo(writer);
+  if (_type == JSON_ARRAY)
+    _content.asArray->writeTo(writer);
 
-  if (_type == JSON_OBJECT) _content.asObject->writeTo(writer);
+  else if (_type == JSON_OBJECT)
+    _content.asObject->writeTo(writer);
 
-  if (_type == JSON_STRING) writer.writeString(_content.asString);
+  else if (_type == JSON_STRING)
+    writer.writeString(_content.asString);
 
-  if (_type == JSON_UNPARSED) writer.writeRaw(_content.asString);
+  else if (_type == JSON_UNPARSED)
+    writer.writeRaw(_content.asString);
 
-  if (_type == JSON_LONG) writer.writeLong(_content.asLong);
+  else if (_type == JSON_LONG)
+    writer.writeLong(_content.asLong);
 
-  if (_type == JSON_BOOLEAN) writer.writeBoolean(_content.asLong);
+  else if (_type == JSON_BOOLEAN)
+    writer.writeBoolean(_content.asLong != 0);
 
-  if (_type >= JSON_DOUBLE_0_DECIMALS) {
+  else if (_type >= JSON_DOUBLE_0_DECIMALS) {
     uint8_t decimals = static_cast<uint8_t>(_type - JSON_DOUBLE_0_DECIMALS);
     writer.writeDouble(_content.asDouble, decimals);
   }
diff --git a/test/JsonParser_Nested_Tests.cpp b/test/JsonParser_Nested_Tests.cpp
index cf239e01..a21e6340 100644
--- a/test/JsonParser_Nested_Tests.cpp
+++ b/test/JsonParser_Nested_Tests.cpp
@@ -13,21 +13,26 @@ TEST(JsonParser_Nested_Tests, ArrayNestedInObject) {
 
   JsonObject &object = jsonBuffer.parseObject(jsonString);
   JsonArray &array1 = object["ab"];
-  JsonArray &array2 = object["cd"];
+  const JsonArray &array2 = object["cd"];
+  JsonArray &array3 = object["ef"];
 
   ASSERT_TRUE(object.success());
 
   ASSERT_TRUE(array1.success());
   ASSERT_TRUE(array2.success());
+  ASSERT_FALSE(array3.success());
 
   ASSERT_EQ(2, array1.size());
   ASSERT_EQ(2, array2.size());
+  ASSERT_EQ(0, array3.size());
 
   EXPECT_EQ(1, array1[0].as<int>());
   EXPECT_EQ(2, array1[1].as<int>());
 
   EXPECT_EQ(3, array2[0].as<int>());
   EXPECT_EQ(4, array2[1].as<int>());
+
+  EXPECT_EQ(0, array3[0].as<int>());
 }
 
 TEST(JsonParser_Nested_Tests, ObjectNestedInArray) {
@@ -37,18 +42,22 @@ TEST(JsonParser_Nested_Tests, ObjectNestedInArray) {
 
   JsonArray &array = jsonBuffer.parseArray(jsonString);
   JsonObject &object1 = array[0];
-  JsonObject &object2 = array[1];
+  const JsonObject &object2 = array[1];
+  JsonObject &object3 = array[2];
 
   ASSERT_TRUE(array.success());
 
   ASSERT_TRUE(object1.success());
   ASSERT_TRUE(object2.success());
+  ASSERT_FALSE(object3.success());
 
   ASSERT_EQ(2, object1.size());
   ASSERT_EQ(2, object2.size());
+  ASSERT_EQ(0, object3.size());
 
   EXPECT_EQ(1, object1["a"].as<int>());
   EXPECT_EQ(2, object1["b"].as<int>());
   EXPECT_EQ(3, object2["c"].as<int>());
   EXPECT_EQ(4, object2["d"].as<int>());
+  EXPECT_EQ(0, object3["e"].as<int>());
 }
diff --git a/test/JsonVariant_As_Tests.cpp b/test/JsonVariant_As_Tests.cpp
index 0461455f..fda2396e 100644
--- a/test/JsonVariant_As_Tests.cpp
+++ b/test/JsonVariant_As_Tests.cpp
@@ -145,6 +145,11 @@ TEST(JsonVariant_As_Tests, RandomStringAsLong) {
   ASSERT_EQ(0L, variant.as<long>());
 }
 
+TEST(JsonVariant_As_Tests, RandomStringAsString) {
+  JsonVariant variant = "hello";
+  ASSERT_EQ(String("hello"), variant.as<String>());
+}
+
 TEST(JsonVariant_As_Tests, TrueStringAsBool) {
   JsonVariant variant = "true";
   ASSERT_TRUE(variant.as<bool>());