The 2.7 SDK is compatible with 6.6 (we’re using it in production with 6.5.1 right now, upgrading to 6.6 as we speak). However, scopes and collections (which are in developer preview in 6.6, scheduled for GA in 7.0) are not available in 2.7. There may be some other features that are unavailable as well. I know I’m working on adding support for compression, hopefully in SDK 3.1, (fingers crossed) which won’t be backported to 2.7.
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