external-dns: external-dns updates incomplete and infinite loop when ingress has several external addresses (cloudflare provider)

I think this issue is the same as described in: https://kubernetes.slack.com/archives/C771MKDKQ/p1509029114000201

Even if there are no changes, and DNS looks correctly, I see and endless stream of updates:

time="2018-08-26T18:01:17Z" level=debug msg="Endpoints generated from ingress: logging/logging-kibana: [kibana.k8s.davidkarlsen.com 0 IN A 192.168.3.3;192.168.3.4;192.168.3.5 kibana.k8s.davidkarlsen.com 0 IN A 192.168.3.3;192.168.3.4;192.168.3.5]"
time="2018-08-26T18:01:17Z" level=debug msg="Removing duplicate endpoint kibana.k8s.davidkarlsen.com 0 IN A 192.168.3.3;192.168.3.4;192.168.3.5"
time="2018-08-26T18:01:23Z" level=info msg="Changing record." action=UPDATE record=kibana.k8s.davidkarlsen.com ttl=1 type=A zone=c1c51c73b8d326febfe9c5fab78ccf43
time="2018-08-26T18:01:29Z" level=info msg="Changing record." action=UPDATE record=kibana.k8s.davidkarlsen.com ttl=1 type=TXT zone=c1c51c73b8d326febfe9c5fab78ccf43

note "A 192.168.3.3;192.168.3.4;192.168.3.5 "

I think there is some flaw since the record generated from ingress has three addresses, but there is only one (the first one) in DNS:

dig kibana.k8s.davidkarlsen.com

; <<>> DiG 9.11.3-1ubuntu1.1-Ubuntu <<>> kibana.k8s.davidkarlsen.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55558
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 713665436d83e2f8826fc84c5b82ebe92ef3a082a79cb40f (good)
;; QUESTION SECTION:
;kibana.k8s.davidkarlsen.com.   IN      A

;; ANSWER SECTION:
kibana.k8s.davidkarlsen.com. 299 IN     A       192.168.3.3

;; AUTHORITY SECTION:
com.                    162976  IN      NS      m.gtld-servers.net.
com.                    162976  IN      NS      b.gtld-servers.net.
com.                    162976  IN      NS      h.gtld-servers.net.
com.                    162976  IN      NS      i.gtld-servers.net.
com.                    162976  IN      NS      l.gtld-servers.net.
com.                    162976  IN      NS      a.gtld-servers.net.
com.                    162976  IN      NS      f.gtld-servers.net.
com.                    162976  IN      NS      g.gtld-servers.net.
com.                    162976  IN      NS      e.gtld-servers.net.
com.                    162976  IN      NS      k.gtld-servers.net.
com.                    162976  IN      NS      j.gtld-servers.net.
com.                    162976  IN      NS      d.gtld-servers.net.
com.                    162976  IN      NS      c.gtld-servers.net.

;; Query time: 199 msec
;; SERVER: 192.168.3.2#53(192.168.3.2)
;; WHEN: Sun Aug 26 20:03:19 CEST 2018
;; MSG SIZE  rcvd: 324

note only one A record is in DNS.

And indeed if I change the other externalAddresses for the ingress to only have one address the excessive updates do not happen.

I have tested with v0.5.4 and v0.5.5 - both have the same problem.