stream: pipeline wait for close before calling the callback
// Use the pipeline API to easily pipe a series of streams // together and get notified when the pipeline is fully done.
stream.pipeline() closes all the streams when an error is raised
pipeline doc: here
The pipeline should wait for close event to finish before calling the callback as that should be the proper "fully done" state.
The finishCount should not below 0 when calling finishImpl function (should not be negative).