Handling Specific Errors in RPC with Effect Typescript

So my RPC can throw a bunch of errors, out of which I want to ignore all of them for now except

MyPreferredError

MyPreferredError

To type the RPC error type, I tried

Schema.Union(Schema.Unknown, MyPreferredError)

Schema.Union(Schema.Unknown, MyPreferredError)

, but that doesn't work ofc because the unknown eats up everything. So how can i do this?

Handling Specific Errors in RPC with Effect Typescript - Effect Community