Bugfix. Replace default isize enum representation. #392

Job	Run time
mavlink-dump	57s
formatting	11s
internal-tests (ardupilotmega)	1m 9s
linting	1m 53s
msrv	1m 27s
internal-tests (asluav)	1m 23s
internal-tests (matrixpilot)	1m 34s
internal-tests (minimal)	1m 11s
internal-tests (paparazzi)	1m 30s
internal-tests (python_array_test)	1m 21s
internal-tests (slugs)	1m 12s
internal-tests (standard)	1m 10s
internal-tests (test)	1m 9s
internal-tests (ualberta)	1m 23s
internal-tests (uavionix)	1m 13s
internal-tests (icarous)	1m 7s
internal-tests (common)	1m 10s
docs	1m 25s
build	0s
test-embedded-size	0s
	22m 25s

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