.NET 8: System.Collections.Frozen not supported about messagepack-csharp

[AArnott]

By all means, if you're interested, you can add a TargetFramework to the project now as part of the feature addition.

[AArnott]

Adding built-in support for these collections makes sense. Would you care to submit the PR?
Alternatively you can write your own formatter and resolver for the types you use, as documented in the README.

Sponsorship may be an effective way to lead a contributor of this repo to prioritize the feature. As a free and open source library, all or the majority of its development is done without any monetary benefit to its authors, and all of it is made available free of charge. But sponsorship is very much appreciated and, with agreement from a particular contributor and/or the owning team, can be a great way to support the project and help get your favorite features or bugs addressed in an upcoming version.
If sponsorship to drive completion of a feature or bug fix is an interesting option to you, please let us know. You can reach out to me privately on keybase.io or gitter.im as well.

[N-Olbert]

@AArnott I took a closer look at this today... As this solution is currently built against .NET 7, this cannot be done at the moment. That's no biggie since as mentioned, a custom resolver works very well.

Anyway, I assume that there will be an upgrade to .NET 8 in the near future (at least shortly before .NET 7 becomes EOL`d). Feel free to ping me again then and I'll be happy to do a PR 😊.

[N-Olbert]

Done by #1730