diff --git a/include/nlohmann/detail/iterators/iter_impl.hpp b/include/nlohmann/detail/iterators/iter_impl.hpp
index bc87de29f..f365d181f 100644
--- a/include/nlohmann/detail/iterators/iter_impl.hpp
+++ b/include/nlohmann/detail/iterators/iter_impl.hpp
@@ -128,6 +128,19 @@ class iter_impl
     iter_impl(const iter_impl<const BasicJsonType>& other) noexcept
         : m_object(other.m_object), m_it(other.m_it) {}
 
+    /*!
+    @brief converting assignment
+    @param[in] other const iterator to copy from
+    @return const/non-const iterator
+    @note It is not checked whether @a other is initialized.
+    */
+    iter_impl& operator=(const iter_impl<const BasicJsonType>& other) noexcept
+    {
+        m_object = other.m_object;
+        m_it = other.m_it;
+        return *this;
+    }
+
     /*!
     @brief converting constructor
     @param[in] other  non-const iterator to copy from
@@ -138,7 +151,7 @@ class iter_impl
 
     /*!
     @brief converting assignment
-    @param[in,out] other  non-const iterator to copy from
+    @param[in] other  non-const iterator to copy from
     @return const/non-const iterator
     @note It is not checked whether @a other is initialized.
     */
diff --git a/include/nlohmann/detail/output/binary_writer.hpp b/include/nlohmann/detail/output/binary_writer.hpp
index a8fddfee8..f52b77874 100644
--- a/include/nlohmann/detail/output/binary_writer.hpp
+++ b/include/nlohmann/detail/output/binary_writer.hpp
@@ -1204,19 +1204,19 @@ class binary_writer
 
             case value_t::number_unsigned:
             {
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int8_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int8_t>::max)()))
                 {
                     return 'i';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::uint8_t>::max)()))
                 {
                     return 'U';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int16_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int16_t>::max)()))
                 {
                     return 'I';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int32_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
                 {
                     return 'l';
                 }
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 65989e024..76ae3b1d9 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -7831,6 +7831,19 @@ class iter_impl
     iter_impl(const iter_impl<const BasicJsonType>& other) noexcept
         : m_object(other.m_object), m_it(other.m_it) {}
 
+    /*!
+    @brief converting assignment
+    @param[in] other const iterator to copy from
+    @return const/non-const iterator
+    @note It is not checked whether @a other is initialized.
+    */
+    iter_impl& operator=(const iter_impl<const BasicJsonType>& other) noexcept
+    {
+        m_object = other.m_object;
+        m_it = other.m_it;
+        return *this;
+    }
+
     /*!
     @brief converting constructor
     @param[in] other  non-const iterator to copy from
@@ -7841,7 +7854,7 @@ class iter_impl
 
     /*!
     @brief converting assignment
-    @param[in,out] other  non-const iterator to copy from
+    @param[in] other  non-const iterator to copy from
     @return const/non-const iterator
     @note It is not checked whether @a other is initialized.
     */
@@ -10872,19 +10885,19 @@ class binary_writer
 
             case value_t::number_unsigned:
             {
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int8_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int8_t>::max)()))
                 {
                     return 'i';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::uint8_t>::max)()))
                 {
                     return 'U';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int16_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int16_t>::max)()))
                 {
                     return 'I';
                 }
-                if (j.m_value.number_unsigned <= (std::numeric_limits<std::int32_t>::max)())
+                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
                 {
                     return 'l';
                 }
diff --git a/test/src/unit-regression.cpp b/test/src/unit-regression.cpp
index 7836b6567..4ac9e5ee6 100644
--- a/test/src/unit-regression.cpp
+++ b/test/src/unit-regression.cpp
@@ -1808,4 +1808,4 @@ template <typename T> class object {};
 template <typename T> class string {};
 template <typename T> class number_integer {};
 template <typename T> class number_unsigned {};
-template <typename T> class number_float {};
\ No newline at end of file
+template <typename T> class number_float {};