Issue Link

Fixes #82

Overview of Changes

• I added Swift 6 to the list of supported Swift versions
  • This has to be .version("6") rather than .v6 in the Package.swift, because Xcode 15 and earlier don't know about .v6
• Some changes to make the library compile in Swift 6:
  • Scope was marked as Sendable. There's no reason it can't be, and without being explicitly Sendable it complained about the static lets.
  • The dynamic member subscript on Store.Wrapper is now explicitly @MainActor. Key paths are not necessarily sendable, and it's only meant to be called in views (= on the main actor) anyways.
  • Synchronizer now explicitly inherits Sendable. There's no way to correctly implement it with a non-sendable type anyways.
  • ErrorCheckMode conforms to BitwiseCopyable. This wasn't strictly necessary, but non-public enums with no payloads do this implicitly, and we aren't going to add any payloads (as indicated by the comment inside the enum), so there's no reason not to add it.
• I added an iOS 18 example by copying the iOS 14 example, removing Mockingbird, and changing the Swift language version to Swift 6. Its tests should be automatically skipped if you run the test script with Xcode 15 or earlier.

Anything you want to highlight?

N/A

Test Plan

The automated tests should pass in both Xcode 15 and 16, and Dependiject itself should compile without errors or warnings in both.