reason := googleAPIErr.Errors[0].Reason
	message := googleAPIErr.Errors[0].Message

	switch reason {
	case "required":
		// Anonymous users does not have storage.xyz access to project 123.
		fallthrough
	case "keyInvalid":
		fallthrough
	case "forbidden":
		err = PrefixAccessDenied{
			Bucket: bucket,
			Object: object,
		}
	case "invalid":
		err = BucketNameInvalid{
			Bucket: bucket,
		}

			// intervals that fall within the spl interval above; they
			// appear earlier in this array of intervals, see
			// ObjectsHistogramIntervals
			splCount += count
			fallthrough
		default:
			res[szInt.name] = count
		}
	}
	return res
}

// add a version count to the histogram.
func (h *versionsHistogram) add(versions uint64) {