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Unshare arrays only when they become shareable #11

Job	Run time
tarball	3m 26s
windows / Windows 2022 (check)	31m 39s
windows / Windows 2025-vs2026 (check)	39m 9s
non_development / non_development (default, false)	3m 49s
non_development / non_development (no-ruby, true)	4m 14s
ubuntu / ubuntu (check, ubuntu-22.04)	9m 53s
non_development / non_development (baseruby-no, false, --with-baseruby=no)	3m 30s
macos / macos (check, macos-26)	13m 0s
ubuntu / ubuntu (test-bundler-parallel, ubuntu-24.04)	13m 15s
ubuntu / ubuntu (test-bundler-parallel, ubuntu-22.04)	10m 22s
ubuntu / ubuntu (test-bundled-gems, ubuntu-24.04)	6m 31s
ubuntu / ubuntu (test-bundled-gems, ubuntu-22.04)	8m 50s
ubuntu / ubuntu (check, ubuntu-24.04)	6m 59s
	2h 34m 37s