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macOS

Unshare arrays only when they become shareable #758

Job	Run time
make (check, macos-15-intel)	21m 38s
make (check, macos-26, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	38m 26s
make (check, macos-26)	33m 53s
make (zjit-test-build, macos-26, --enable-zjit=dev --with-gmp)	7m 33s
make (test-bundled-gems, macos-26)	8m 45s
make (check, xcode-27)	15m 26s
make (check, macos-15, --with-gcc=gcc-14)	13m 48s
make (check, macos-15)	10m 55s
make (test-bundler-parallel, macos-26)	25m 55s
macOS result	3s
	2h 56m 22s