Make `ioHasBufFS` more general #221

Job	Run time
cabal-check (9.6.4, 3.10.3.0, ubuntu-latest)	2m 28s
stylish-haskell (9.6.4, 3.10.3.0, ubuntu-latest)	12m 28s
cabal-fmt (9.6.4, 3.10.3.0, ubuntu-latest)	2m 27s
build (8.10.7, 3.10.3.0, ubuntu-latest)	2m 1s
build (8.10.7, 3.10.3.0, windows-latest)	4m 16s
build (8.10.7, 3.10.3.0, macOS-13)	14m 38s
build (9.2.8, 3.10.3.0, ubuntu-latest)	1m 55s
build (9.2.8, 3.10.3.0, windows-latest)	3m 34s
build (9.2.8, 3.10.3.0, macOS-13)	9m 19s
build (9.4.8, 3.10.3.0, ubuntu-latest)	2m 25s
build (9.4.8, 3.10.3.0, windows-latest)	4m 22s
build (9.4.8, 3.10.3.0, macOS-13)	10m 55s
build (9.6.4, 3.10.3.0, ubuntu-latest)	2m 41s
build (9.6.4, 3.10.3.0, windows-latest)	5m 6s
build (9.6.4, 3.10.3.0, macOS-13)	10m 44s
build (9.8.2, 3.10.3.0, ubuntu-latest)	1m 15s
build (9.8.2, 3.10.3.0, windows-latest)	4m 0s
build (9.8.2, 3.10.3.0, macOS-13)	11m 5s
	1h 45m 39s

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