* guarantee that as long as we also require the input type to be non-null[*] (which is a
 * requirement that existing callers already fulfill).
 *
 * Disclaimer: Part of the reason that callers are so well adapted to `Function<A, B>` may be that
 * that is how the signature looked even prior to this comment! So naturally any change can break
 * existing users, but it can't *fix* existing users because any users who needed

		if wantFormat.has(FormatPAX) && !preferPAX {
			wantFormat.mayBe(FormatUSTAR) // PAX implies USTAR allowed too
		}
		format.mayOnlyBe(wantFormat) // Set union of formats allowed and format wanted
	}
	if format == FormatUnknown {
		switch h.Format {
		case FormatUSTAR:
			err = headerError{"Format specifies USTAR", whyNoUSTAR, whyOnlyPAX, whyOnlyGNU}
		case FormatPAX:

	p.mu.Lock()
	defer p.mu.Unlock()

	if (checkOld > 0 && len(p.lrgworkers) != checkOld) || n == len(p.lrgworkers) || n < 1 {
		// Either already satisfied or worker count changed while we waited for the lock.
		return
	}
	for len(p.lrgworkers) < n {
		input := make(chan ReplicationWorkerOperation, 100000)
		p.lrgworkers = append(p.lrgworkers, input)

	var zb0001 uint32
	zb0001, err = dc.ReadArrayHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	if zb0001 != 7 {
		err = msgp.ArrayError{Wanted: 7, Got: zb0001}
		return
	}
	err = dc.ReadExactBytes((z.VersionID)[:])
	if err != nil {
		err = msgp.WrapError(err, "VersionID")
		return
	}
	z.ModTime, err = dc.ReadInt64()
	if err != nil {

		atomic.AddInt64(&called, 1)
	})

	DB.Preload("Level2s").First(&Level1{}, "id = ?", lvl.ID)

	if called != 3 {
		t.Errorf("Wanted callback to be called 3 times but got %d", called)
	}

        // Test implementation
    }
    
    public boolean waitForNotification(long timeoutMs) throws InterruptedException {
        return latch.await(timeoutMs, TimeUnit.MILLISECONDS);
    }
    
    public boolean isNotificationReceived() {
        return notificationReceived;
    }
}
```

## 8. Error Handling and Reliability

  //
  // ...where "@JointlyNullable" is similar to @PolyNull but slightly different:
  //
  // - @PolyNull means "@Nullable or @Nonnull"
  //   (That would be unsound for an input Iterable<@Nullable Foo>. So, if we wanted to use
  //   @PolyNull, we would have to restrict this method to non-null <T>. But it has users who pass
  //   iterables with null elements.)
  //
  // - @JointlyNullable means "@Nullable or no annotation"

          call: Call,
          response: Response,
        ) {
          response.close()
          completionLatch.countDown()
        }
      }
    call.enqueue(callback)
    completionLatch.await()
    assertThat(listener.recordedEventTypes()).containsExactly(
      "CallStart",
      "ProxySelectStart",
      "ProxySelectEnd",
      "DnsStart",
      "DnsEnd",
      "ConnectStart",

            latch.countDown();
        }).error(t -> {
            t.printStackTrace();
            latch.countDown();
            fail();
        });
        latch.await();
        assertEquals(num, numObInputDoc.get());

        SuggestResponse response = suggester.suggest().setQuery("test").setSuggestDetail(true).execute().getResponse();
        assertEquals(1, response.getNum());
    }

			continue
		}
		// Two flushes, to verify the error is sticky.
		for i := 0; i < 2; i++ {
			e = buf.Flush()
			if e != w.expect {
				t.Errorf("Flush %d/2 %v: got %v, wanted %v", i+1, w, e, w.expect)
			}
		}
	}
}

func TestNewReaderSizeIdempotent(t *testing.T) {
	const BufSize = 1000
	b := NewReaderSize(strings.NewReader("hello world"), BufSize)