=== unbounded stream; client takes 100, then goes quiet ===
protocol       quiet 0.5s   quiet 1s   quiet 2s
RSocket               100        100        100
gRPC              142,000    680,542  1,346,233
WebSocket          23,693    125,099    311,617
RSocket is flat: the server produced exactly what request(n) asked for.
gRPC grows 9.5x between 0.5 s and 2 s; WebSocket grows 13.2x.
Growth that tracks the wait, rather than settling at a buffer size,
means nothing bounded the producer. (Growth is faster than linear
because the loop is still being JIT-compiled during the first run.)