This is an interesting one (http://geoserver.org/display/GEOS/GSIP+70+-+Reduce+CatalogFacade+API) introduced in January but has collected no votes? It focuses on using generics to reduce the number of methods.
I have found that introducing generics tends to make things more difficult, and I still often put in the specific concrete method in the subclass (in order to write a more helpful javadoc). However they do provide more safety (and prevent me screwing up the method in the subclass).
There is a small impact on backwards compatibility, that is not noted in the proposal: Any future changes applied to master would no longer smoothly apply to the stable branch.
Still +1 as any reduction in methods / improvements to consistency are a good thing.
Actions: Updated proposal with current PSC list, since this has no JIRA, not patch and is an API change I assume we can revisit it in 6 months time.
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Jody Garnett