Otherwise the connection can stall due the indefinite delay of an explicit ACK,
for exapmle:
-> client sends the last Finished message
<- server sends the ACK, but the ACK is lost
-> client rentrasmit the Finished message
- server delay sending of the ACK until a fast timeout
-> client rentrasmit the Finished message quicker than the server timeout
- server resets the timeout, delaying sending the ACK
-> client rentrasmit the Finished...
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