v4.2.1

• Fixed #807: Improves lifetime scope cleanup for shared instances.
• Marked ContainerBuilder.Update obsolete

For people using ContainerBuilder.Update, we have opened a discussion issue to help you try working around use of Update, explain why we're looking at making it obsolete, and find out where gaps in functionality might be so we can fill those gaps prior to removal.

Fear not, it'll still be around for a while. We just want folks to start looking at fixing things up, or, if it turns out we can't remove Update, find out why it's required so we can address those challenges.