Bug: Calling a Service Binding RPC method throws a DOMException

[JacobMarshallPP]

When using this package and calling a Service Binding's RPC property - the following error is thrown.

DOMException {
  code: 25,
  name: 'DataCloneError',
  message: 'Could not serialize object of type "Fetcher". This type does not support serialization.'
}

It admittedly took me a while to figure out where this was coming from, but I finally narrowed it down to the following line of code:

otel-cf-workers/src/wrap.ts

Line 51 in 6f1c790

const bound = value.bind(thisArg)

More specifically, it looks like calling .bind actually returns an RpcPromise, not a function. And then the actual error occurs when calling the "bound" function (which at this point is actually a promise-like object). I didn't spend too much time looking into that, but that was my initial assessment.

I have a fix for this locally, so I'm creating this issue to have an issue ID to reference in my pull request :)