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Commit "[coreimage] CIImageAccumulator init returns nil in beta 4"  enable (public) some API that were only (half exposed) in XM and might not be correct (or could be better).
The origin for this needs to be found (before open sourcing).
Old XM only API added, likely before CIFormat was added, more than 6 years ago in
They were hidden (good) when CIImageAccumulator was added in iOS9, but correct ones were not provided (bad)
PR https://github.com/xamarin/xamarin-macios/pull/2412 obsolete the "bad" and provide better (CIFormat based) overloads.
PR merged in https://github.com/xamarin/xamarin-macios/commit/00476e0bad1d83364ab15a6c4294c5a50b3fd74e