The tuple carries a protocol byte and two port numbers.
Protocol names the next rule test
The protocol byte is 6, which this toy table names TCP.
protocol=6
Ports are exact integers
The tuple carries source port 40000 and destination port 443.
40000→443
This is only a tuple
The tuple has no memory of prior packets. It is just the pinned fields the ordered rules will test.
fields=5
Summary
For this toy decision, protocol and ports are checked as exact small integers.
destination port=443