adds fixme note

src/Umbraco.Web/Models/Mapping/ContentPropertyBasicMapper.cs

@@ -51,6 +51,8 @@ namespace Umbraco.Web.Models.Mapping
             dest.PropertyEditor = editor;
             dest.Editor = editor.Alias;
 
+            //fixme: although this might get cached, if a content item has 100 properties of different data types, then this means this is going to be 100 extra DB queries :( :( :(
+            // - ideally, we'd just have the DataTypeKey alongside the DataTypeId which is loaded in the single sql statement which should be relatively easy.
             var dataTypeKey = _entityService.GetKey(property.PropertyType.DataTypeId, UmbracoObjectTypes.DataType);
             if (!dataTypeKey.Success)
                 throw new InvalidOperationException("Can't get the unique key from the id: " + property.PropertyType.DataTypeId);