> Does that mean that this mono project and its associated repo and what is within the dotnet repo are not the same and could (if they have not already) diverge

> Does that mean that this mono project and its associated repo and what is within the dotnet repo are not the same and could (if they have not already) diverge? Yes, they have diverged. Just as Microsoft forked the CLR to create CoreCLR, so too has mono been forked. Features like multiple AppDomains have been removed from this fork. Here is an example pull request: https://github.com/dotnet/runtime/pull/47955 https://github.com/dotnet/runtime/pull/47955