deploy: 69a0c1b82c

api/basic_json/object_t.md

@@ -26,7 +26,8 @@ To store objects in C++, a type is defined by the template parameters described
 
 `StringType`
 :   the type of the keys or names (e.g., `std::string`). The comparison function `std::less<StringType>` is used to
-    order elements inside the container.
+    order elements inside the container. `object_t::key_type` must be implicitly convertible to `string_t` (required by the
+    binary formats).
 
 `AllocatorType`
 :   the allocator to use for objects (e.g., `std::allocator`)