Providing more than 10 streams to derivedStream results in a stream of type Observable<unknown>

[OyvindSabo]

I encountered a case where I need to derive a stream from 11 streams, which results in derivedStream not being able to infer the return type. I see in https://github.com/ardoq/rxbeach/blob/master/src/derivedStream.ts that the return type of derivedStream is only hard-coded for up to 10 stream arguments. If these have to be hard-coded it would be nice if more than 10 stream arguments were supported.