Clarification Needed on `Stream.buffer` Behavior with Capacity 4 in Example Code

const stream = Stream.range(1, 10).pipe(
  Stream.tap((n) => Console.log(`before buffering: ${n}`)),
  Stream.buffer({ capacity: 4 }),
  Stream.tap((n) => Console.log(`after buffering: ${n}`)),
  Stream.schedule(Schedule.spaced('1 seconds')),
);
Effect.runPromise(Stream.runCollect(stream)).then(console.log);

before buffering: 1
before buffering: 2
before buffering: 3
before buffering: 4
before buffering: 5
before buffering: 6
after buffering: 1
after buffering: 2
before buffering: 7
after buffering: 3
before buffering: 8
after buffering: 4
before buffering: 9
after buffering: 5
before buffering: 10
after buffering: 6
after buffering: 7
after buffering: 8
after buffering: 9
after buffering: 10
{
  _id: "Chunk",
  values: [
    1, 2, 3, 4,  5,
    6, 7, 8, 9, 10
  ]
}