[DS][RFC-190] Within a component instance for each reference to the same service the same object needs to be injected

When using reference scope prototype (or prototype_required), when a component instance references the same service multiple time, each reference must use the same service instance rather than a unique instance.

See DS spec section 122.3.5:

prototype:
That is, for a given bound service, each component instance may use a distinct service object but within a component instance all references to the bound service will use the same service object.

prototype_required:
That is, for a given bound service, each component instance will use a distinct service object but within a component instance all references to the bound service will use the same service object.