Accept either comma delimited or flattened channel string as valid #1114

Job	Run time
Run CI / Build / Build	1m 7s
Run CI / Generate docs / Generate docs	57s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.8)	49s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	49s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	55s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	40s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	1m 13s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.8)	1m 39s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	1m 25s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	1m 36s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	1m 37s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	1m 27s
Run CI / Run system tests / Run system tests (win-10-py32)	32m 56s
Run CI / Run system tests / Run system tests (win-10-py64)	32m 10s
Run CI / Report test results / Report test results	16s
	1h 19m 36s

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