[xwiki-devs] Activity Stream no more properly subclassable in 3.5?

hello devs, having moved Curriki to the 3.5 core, we noticed our activity stream was having empty getDisplayBody... looking more closely revealed that the objects were all of type ActivityEvent while a family of sub-classes was available in the CurrikiActivityStream: the method ActivityStreamPluginApi.wrapEvents was made private hence its subclass was ignored! This appears to have been made at https://github.com/xwiki/xwiki-platform/commit/1837196f0f6434603c4c24a13b7c… as part of a "code cleanup". Jean-Vincent, or someone else, could you explain the rationale behind it? I am sure this was checked for "others usages" but Curriki was not considered as part of that. Having somewhat fixed this on my side by bringing more methods to the subclass (for the display of older events), I come to realize that newer events are also not of the right type so I'll have to hunt more for "compromised subclassing"... This is rather an API breakage to my taste. Has there been a policy about this? Could we set-up one? I wonder if such a search engine exists that would have indicated that such a breakage would have been avoided. paul