refactor: make asBoolean public #4786

Job	Run time
check_format_and_unit_tests	1m 13s
special_integration_tests (11)	1m 48s
special_integration_tests (17)	1m 52s
httpclient-tests (jdk) / integration_tests	19m 37s
httpclient-tests (jetty) / integration_tests	18m 57s
httpclient-tests (vertx) / integration_tests	19m 6s
integration_tests (11, 1.30.3) / integration_tests	19m 0s
integration_tests (11, 1.31.0) / integration_tests	21m 10s
integration_tests (11, v1.28.12) / integration_tests	19m 8s
integration_tests (11, v1.29.7) / integration_tests	19m 0s
integration_tests (17, 1.30.3) / integration_tests	19m 6s
integration_tests (17, 1.31.0) / integration_tests	20m 6s
integration_tests (17, v1.28.12) / integration_tests	19m 10s
integration_tests (17, v1.29.7) / integration_tests	19m 13s
	3h 38m 26s

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