Cleanups and suggestions from IntelliJ #13

Job	Run time
Ruby memcheck	54s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	59s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	31s
ubuntu-22.04 3.2	38s
ubuntu-22.04 3.3	36s
ubuntu-22.04 head	1m 20s
ubuntu-22.04 jruby	1m 4s
ubuntu-22.04 jruby-head	1m 13s
macos-13 2.7	1m 51s
macos-13 3.0	50s
macos-13 3.1	39s
macos-13 3.2	35s
macos-13 3.3	34s
macos-13 head	52s
macos-13 jruby	1m 20s
macos-13 jruby-head	1m 33s
macos-14 2.7	58s
macos-14 3.0	28s
macos-14 3.1	29s
macos-14 3.2	20s
macos-14 3.3	23s
macos-14 head	21s
macos-14 jruby	44s
macos-14 jruby-head	43s
windows-latest 2.7	4m 41s
windows-latest 3.0	2m 6s
windows-latest 3.1	2m 36s
windows-latest 3.2	2m 22s
windows-latest 3.3	4m 10s
windows-latest head	1m 41s
windows-latest mswin	1m 0s
ubuntu-latest jruby-9.4	1m 12s
macos-latest truffleruby-head	29s
ubuntu-latest truffleruby-head	1m 54s
	42m 38s

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