func (b *packetBuffer) Split() {
	b.refCount++
}
Split increases the refCount.
It must be called when a packet buffer is used for more than one packet,
e.g. when splitting coalesced packets.
package quic
import (
	"sync"
	"github.com/lucas-clemente/quic-go/internal/protocol"
)
type packetBuffer struct {
	Slice []byte
	refCount int
}