4.x
4.x: Cleanup: Serial annotation, getFirst usage (#8180)
4.x: Streamable ~ separate streamer cancellation & DisposableContainer (#8223)
4.x: Streamable + repeat, repeatWhen, retry, retryWhen (#8232)
4.x: Streamable optimizations 2026.07.21 (#8254)
Package shift from .rxjava3 to .rxjava4