Eliminate ambiguity; make use of GHC2021's NamedFieldPuns #2720

Job	Run time
Pedantic	5m 5s
Pedantic	5m 5s
Unit tests (ubuntu-latest)	2m 6s
Unit tests (ubuntu-latest)	2m 6s
Unit tests (ubuntu-latest, alpine, --docker --system-ghc --no-install-ghc --flag stack:static)	46s
Unit tests (ubuntu-latest, alpine, --docker --system-ghc --no-install-ghc --flag stack:static)	3m 50s
Unit tests (windows-latest)	8m 46s
Unit tests (windows-latest)	8m 46s
Unit tests (macos-latest)	4m 4s
Unit tests (macos-latest)	4m 4s
	44m 38s

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