Allow _Bool to be printed as "_Bool" or "bool" in the tests. #261

Job	Run time
Tests (ubuntu-latest, 4.03.0)	8m 40s
Tests (ubuntu-latest, 4.04.0)	9m 0s
Tests (ubuntu-latest, 4.05.0)	9m 10s
Tests (ubuntu-latest, 4.06.0)	9m 20s
Tests (ubuntu-latest, 4.07.0)	7m 49s
Tests (ubuntu-latest, 4.08.0)	5m 54s
Tests (ubuntu-latest, 4.09.0)	6m 5s
Tests (ubuntu-latest, ocaml-variants.4.11.2+fp+flambda)	6m 58s
Tests (ubuntu-latest, 4.11.1)	6m 49s
Tests (ubuntu-latest, 4.12.0)	5m 55s
Tests (ubuntu-latest, 4.13.1)	5m 47s
Tests (ubuntu-latest, 4.14.0)	5m 42s
Tests (ubuntu-latest, 5.0.0)	6m 8s
Tests (ubuntu-latest, 5.1.0)	6m 49s
Tests (ubuntu-latest, 5.2.0)	6m 21s
Tests (windows-latest, 4.13.1)	13m 0s
Tests (macos-latest, 4.13.1)	5m 30s
	2h 4m 57s

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