=== unbounded stream; client takes 100, then goes quiet ===
protocol       quiet 0.5s   quiet 1s   quiet 2s
RSocket               100        100        100
gRPC              103,425    449,318  1,208,219
WebSocket          19,664    143,870    320,255
RSocket is flat: the server produced exactly what request(n) asked for.
gRPC grows 11.7x between 0.5 s and 2 s; WebSocket grows 16.3x.
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.)