Took a look at the latest IRIS library, it is not dotnet standard nor core.  It is actually based on .NET 4.5 which is not even supported by MSFT any longer.  Looking at the structure of the Cache v. IRIS, it appears to be very similar.  I wonder if it is a "port".

As more and more clients of Intersystems are moving to modern architectures that are not coupled to the OS, it would be in their interest to spend a bit of time porting their existing libraries to dotnet core.