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🔒 The `sending` keyword has special behavior when applied to closure arguments, as well as `inout` arguments. We will employ our knowledge of "disconnected" and "task-isolated" regions to get an understanding for how they work, why nested closures are problematic, and how a throwback from our second episode can help us grapple with `inout sending`.

🔒 The `sending` parameter is a powerful concurrency tool new to Swift 6 that allows you to precisely specify how non-sendable values can cross isolation boundaries. We will explore how it works in terms of "region-based isolation," and how we can send values into and out of functions as "disconnected" objects that are free to travel across isolation boundaries.

🔒 "Region-based isolation" expanded the definition of isolation beyond actors to something called "regions." Learn what a region is, how they work, and how they loosened the overly strict sendability rules of Swift 5.

🔒 Swift 6.2 introduced a brand new vision for "approachable concurrency." This includes two new features that make working with async code much easier: nonisolated-nonsending, and actor-isolated conformances. Let's thoroughly explore both topics and see how they improve things.