[refactor] share empty read-only byte-buffer #363

Job	Run time
maven-test (11, temurin, jruby-9.2.20.1)	2m 2s
maven-test (jruby-9.4.14.0, 25, temurin)	1m 51s
maven-test (jruby-9.4.14.0, 21, temurin)	1m 43s
maven-test (jruby-9.4.14.0, 8, temurin)	1m 54s
maven-test (jruby-9.4.14.0, 11, temurin)	1m 16s
maven-test (8, temurin, jruby-9.3.3.0)	1m 29s
maven-test (21, temurin, jruby-10.0.4.0)	1m 42s
maven-test (21, corretto, jruby-head)	1m 37s
maven-test (21, oracle, jruby-9.3.13.0)	1m 22s
maven-test (24, zulu, jruby-10.0.1.0)	1m 54s
maven-test (11, temurin, jruby-9.3.13.0)	1m 43s
maven-test (8, temurin, jruby-9.2.19.0)	2m 8s
maven-test (21, oracle, jruby-9.4.8.0)	1m 46s
maven-test (25, temurin, jruby-10.0.3.0)	1m 45s
maven-test (11, zulu, jruby-9.4.5.0)	1m 55s
	26m 7s

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