allow persistent-2.18 #3983

Job	Run time
Pedantic	43s
Unit tests (ubuntu-latest)	16m 31s
Unit tests (windows-latest)	22m 51s
Unit tests (macos-latest)	25m 59s
Unit tests (ubuntu-latest, alpine, --docker --system-ghc --no-install-ghc --flag stack:static)	24m 12s
	1h 30m 16s

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