s.writeErrorResponse(w, errInvalidArgument)
		return
	}
	var verifier *BitrotVerifier
	if r.Form.Get(storageRESTBitrotAlgo) != "" {
		hashStr := r.Form.Get(storageRESTBitrotHash)
		var hash []byte
		hash, err = hex.DecodeString(hashStr)
		if err != nil {
			s.writeErrorResponse(w, err)
			return
		}
		verifier = NewBitrotVerifier(BitrotAlgorithmFromString(r.Form.Get(storageRESTBitrotAlgo)), hash)

		if i >= 0 && i < h.sigTParams.Len() && t == h.sigTParams.At(i) {
			return 9173 + 3*uint32(i)
		}
	}
	return h.hashPtr(t.Obj())
}

// hashPtr hashes the pointer identity of ptr. It uses h.ptrMap to ensure that
// pointers values are not dependent on the GC.
func (h Hasher) hashPtr(ptr any) uint32 {
	if hash, ok := h.ptrMap[ptr]; ok {
		return hash
	}
	hash := uint32(reflect.ValueOf(ptr).Pointer())