refactor: make asBoolean public #4784

Job	Run time
special_integration_tests (17)	2m 0s
check_format_and_unit_tests	1m 23s
special_integration_tests (21)	1m 44s
httpclient-tests (jdk) / integration_tests	21m 41s
httpclient-tests (jetty) / integration_tests	21m 51s
httpclient-tests (vertx) / integration_tests	21m 45s
integration_tests (17, 1.30.3) / integration_tests	22m 3s
integration_tests (17, 1.31.0) / integration_tests	22m 43s
integration_tests (17, v1.29.7) / integration_tests	22m 8s
integration_tests (17, v1.28.12) / integration_tests	21m 44s
integration_tests (21, 1.30.3) / integration_tests	21m 47s
integration_tests (21, 1.31.0) / integration_tests	23m 37s
integration_tests (21, v1.28.12) / integration_tests	21m 43s
integration_tests (21, v1.29.7) / integration_tests	22m 15s
	4h 8m 24s

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