Concurrency-unsafe interactions with PDFDocument

[Supereg]

Description

The PR #51 added several concurrency issues that makes this package not compile in Swift 6 mode. The problem manifest around the ConsentDocumentExport actor. In its current design in requires the PDFDocument to cross isolation boundaries which is not possible as the type is not Sendable. The PDFDocument is an open class and therefore cannot be Sendable by definition.

Generally

Reproduction

Just compile the package, ideally with the latest Xcode 16 release.

Expected behavior

SpeziOnboarding should be compatible with Swift 6.

Additional context

Non-sendable types can cross actor boundaries, if they are passed as sending parameters. A solution to this problem might need to investigate new language features of the Swift 6 toolchain.

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

[PSchmiedmayer]

Thank you for taking a look at this @Supereg; I added a longer comment in #58 👍