worked everywhere that I know of except for one place: when running the GWT
    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see
    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
    for details.

    public void testStatistics() throws Exception {
        long initialAllocated = bufferManager.getTotalAllocated();

        // Allocate regions larger than pool buffer size to force new allocations
        RdmaMemoryRegion region1 = bufferManager.getSendRegion(131072); // 128KB > 64KB pool size
        RdmaMemoryRegion region2 = bufferManager.getSendRegion(131072); // Another large allocation

		t.Fatalf("bytepool length invalid: got %v want %v", len(b), width)
	}
	if cap(b) != capWidth {
		t.Fatalf("bytepool cap invalid: got %v want %v", cap(b), capWidth)
	}

	bp.Put(b)

	// Fill the pool beyond the capped pool size.
	for i := uint64(0); i < size*2; i++ {
		bp.Put(make([]byte, bp.w, bp.wcap))
	}

	b = bp.Get()
	if len(b) != width {
		t.Fatalf("bytepool length invalid: got %v want %v", len(b), width)
	}

	}

	return s
}

// JSONPool is a pool for JSON objects that unmarshal into T.
type JSONPool[T any] struct {
	pool    sync.Pool
	emptySz int
}

// NewJSONPool returns a new JSONPool.
func NewJSONPool[T any]() *JSONPool[T] {
	var t T
	sz := 128
	if b, err := json.Marshal(t); err != nil {
		sz = len(b)
	}
	return &JSONPool[T]{
		pool: sync.Pool{
			New: func() any {
				var t T

		case "StopDiskAtLimit":
			z.StopDiskAtLimit, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "StopDiskAtLimit")
				return
			}
		case "pool":
			z.pool, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "pool")
				return
			}
		case "set":
			z.set, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "set")
				return
			}
		default:

		}
	}

	if pools, ok := objAPI.(*erasureServerPools); ok {
		pools.StopRebalance()
	}
}

// LoadRebalanceMeta notifies all peers to load rebalance.bin from object layer.
// Note: Only peers participating in rebalance operation, namely the first node
// in each pool will load rebalance.bin.

	return HashBorrower{pool: &s.HasherPool, borrowed: make([]hash.Hash, 0, 2)}
}

// HashBorrower keeps track of borrowed hashers and allows to return them all.
type HashBorrower struct {
	pool     *bpool.Pool[hash.Hash]
	borrowed []hash.Hash
}

// Borrow a single hasher.
func (h *HashBorrower) Borrow() hash.Hash {
	hasher := h.pool.Get()
	h.borrowed = append(h.borrowed, hasher)
	hasher.Reset()

	}

	return f
}

type bufPool struct {
	sz   int
	pool bpool.Pool[*[]byte]
}

func (b *bufPool) Put(buf []byte) {
	if cap(buf) < b.sz || cap(buf) > b.sz*2 {
		// Buffer too small or will likely leak memory after being expanded.
		// Drop it.
		return
	}
	b.pool.Put(&buf)
}

func (b *bufPool) Get() []byte {
	bufp := b.pool.Get()
	if bufp == nil || cap(*bufp) < b.sz {
		return make([]byte, 0, b.sz)

		ctx := r.Context()
		select {
		case pool <- struct{}{}:
			defer func() { <-pool }()
			globalHTTPStats.addRequestsInQueue(-1)
			if contextCanceled(ctx) {
				w.WriteHeader(499)
				return
			}
			f.ServeHTTP(w, r)
		case <-r.Context().Done():
			globalHTTPStats.addRequestsInQueue(-1)
			// When the client disconnects before getting the S3 handler

				continue
			}
		case "id":
			o.ID = kv[1]
		case "return":
			o.ID = mustGetUUID()
			o.Create = true
		case "p": // pool
			v, err := strconv.ParseInt(kv[1], 10, 64)
			if err != nil {
				o.ID = mustGetUUID()
				o.Create = true
				continue
			}
			o.pool = int(v)
		case "s": // set
			v, err := strconv.ParseInt(kv[1], 10, 64)
			if err != nil {
				o.ID = mustGetUUID()
				o.Create = true