Swift 6.1 async/await support for SCAN and other commands

[nysander]

Problem

RediStack 1.6.2 does not support async/await for SCAN and other commands, which blocks full adoption of Swift 6.1 concurrency and modern async patterns in server-side Swift applications. The lack of async/await support for SCAN means fallback and cache search logic cannot be implemented in a scalable, non-blocking way. Workarounds (such as sync helpers) are not compatible with Swift concurrency rules and can introduce thread-safety and performance issues.

Why This Matters

• Many developers want to use async/await throughout their codebase for clarity, safety, and performance
• Non-blocking Redis operations are essential for scalable, modern Swift server applications
• SCAN is required for efficient cache/fallback lookups; blocking or sync workarounds are not acceptable for production
• Swift 6.1+ adoption is blocked without proper async/await support

Request

• Add async/await support for SCAN and other Redis commands
• Ensure compatibility with Swift 6.1+ concurrency rules
• Provide migration path from sync to async APIs
• Document any breaking changes

Environment

• Swift 6.1+
• RediStack 1.6.2
• Server-side Swift applications