// value up to 2^53 and size classes are relatively small
		// (nowhere near 2^48 even) so this will give us exact
		// boundaries.
		sizeClassBuckets[i] = float64(class_to_size[i] + 1)
	}
	sizeClassBuckets = append(sizeClassBuckets, float64Inf())

	timeHistBuckets = timeHistogramMetricsBuckets()
	metrics = map[string]metricData{
		"/cgo/go-to-c-calls:calls": {