fix get() for embedded zeroes in key

This method had been overlooked.
diff --git a/include/json/value.h b/include/json/value.h
index 443f446..cf9703b 100644
--- a/include/json/value.h
+++ b/include/json/value.h
@@ -404,15 +404,19 @@
   const Value& operator[](const CppTL::ConstString& key) const;
 #endif
   /// Return the member named key if it exist, defaultValue otherwise.
+  /// \note deep copy
   Value get(const char* key, const Value& defaultValue) const;
   /// Return the member named key if it exist, defaultValue otherwise.
+  /// \note deep copy
   /// \param key may contain embedded nulls.
   Value get(const char* key, const char* end, const Value& defaultValue) const;
   /// Return the member named key if it exist, defaultValue otherwise.
+  /// \note deep copy
   /// \param key may contain embedded nulls.
   Value get(const std::string& key, const Value& defaultValue) const;
 #ifdef JSON_USE_CPPTL
   /// Return the member named key if it exist, defaultValue otherwise.
+  /// \note deep copy
   Value get(const CppTL::ConstString& key, const Value& defaultValue) const;
 #endif
   /// Most general and efficient version of isMember()const, get()const,