// Add on the estimated number of overflow buckets
		// required to insert the median number of elements
		// used with this value of b.
		nbuckets += bucketShift(b - 4)
		sz := t.Bucket.Size_ * nbuckets
		up := roundupsize(sz, !t.Bucket.Pointers())
		if up != sz {
			nbuckets = up / t.Bucket.Size_
		}
	}

	if dirtyalloc == nil {
		buckets = newarray(t.Bucket, int(nbuckets))
	} else {