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Add 5.5.0 CMSG handlers #1238

Job	Run time
build (ubuntu-latest, Debug)	1m 44s
build (ubuntu-latest, Release)	1m 39s
build (windows-latest, Debug)	3m 42s
build (windows-latest, Release)	2m 19s
build (macos-14, Debug)	1m 7s
build (macos-14, Release)	1m 4s
	11m 35s

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