diff --git a/brion/detail/json.hpp b/brion/detail/json.hpp
index fd430fab..95723ce3 100644
--- a/brion/detail/json.hpp
+++ b/brion/detail/json.hpp
@@ -1,3 +1,5 @@
+/* clang-format off */
+
 /*
     __ _____ _____ _____
  __|  |   __|     |   | |  JSON for Modern C++
@@ -125,7 +127,7 @@ using json = basic_json<>;
     "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
 #endif
 #elif defined(__GNUC__) && !(defined(__ICC) || defined(__INTEL_COMPILER))
-#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40900
+#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
 #error \
     "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
 #endif
@@ -10983,6 +10985,23 @@ class basic_json
         return object.release();
     }
 
+    /// helper for insertion of an iterator (supports GCC 4.8+)
+    template<typename... Args>
+    iterator insert_iterator(const_iterator pos, Args&& ... args)
+    {
+        iterator result(this);
+        assert(m_value.array != nullptr);
+
+        auto insert_pos = std::distance(m_value.array->begin(), pos.m_it.array_iterator);
+        m_value.array->insert(pos.m_it.array_iterator, std::forward<Args>(args)...);
+        result.m_it.array_iterator = m_value.array->begin() + insert_pos;
+
+        // For GCC 4.9+ only, this could become:
+        // result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, cnt, val);
+
+        return result;
+    }
+
     ////////////////////////
     // JSON value storage //
     ////////////////////////
@@ -15203,10 +15222,7 @@ class basic_json
             }
 
             // insert to array and return iterator
-            iterator result(this);
-            result.m_it.array_iterator =
-                m_value.array->insert(pos.m_it.array_iterator, val);
-            return result;
+            return insert_iterator(pos, val);
         }
 
         JSON_THROW(type_error::create(309, "cannot use insert() with " +
@@ -15259,10 +15275,7 @@ class basic_json
             }
 
             // insert to array and return iterator
-            iterator result(this);
-            result.m_it.array_iterator =
-                m_value.array->insert(pos.m_it.array_iterator, cnt, val);
-            return result;
+            return insert_iterator(pos, cnt, val);
         }
 
         JSON_THROW(type_error::create(309, "cannot use insert() with " +
@@ -15329,12 +15342,10 @@ class basic_json
         }
 
         // insert to array and return iterator
-        iterator result(this);
-        result.m_it.array_iterator =
-            m_value.array->insert(pos.m_it.array_iterator,
-                                  first.m_it.array_iterator,
-                                  last.m_it.array_iterator);
-        return result;
+        return insert_iterator(
+                               pos,
+                               first.m_it.array_iterator,
+                               last.m_it.array_iterator);
     }
 
     /*!
@@ -15378,11 +15389,7 @@ class basic_json
         }
 
         // insert to array and return iterator
-        iterator result(this);
-        result.m_it.array_iterator =
-            m_value.array->insert(pos.m_it.array_iterator, ilist.begin(),
-                                  ilist.end());
-        return result;
+        return insert_iterator(pos, ilist.begin(), ilist.end());
     }
 
     /*!
@@ -17933,15 +17940,15 @@ class basic_json
 
     @since version 3.0.0
     */
-    void merge_patch(const basic_json& patch)
+    void merge_patch(const basic_json& jspatch)
     {
-        if (patch.is_object())
+        if (jspatch.is_object())
         {
             if (not is_object())
             {
                 *this = object();
             }
-            for (auto it = patch.begin(); it != patch.end(); ++it)
+            for (auto it = jspatch.begin(); it != jspatch.end(); ++it)
             {
                 if (it.value().is_null())
                 {
@@ -17955,7 +17962,7 @@ class basic_json
         }
         else
         {
-            *this = patch;
+            *this = jspatch;
         }
     }