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Fix runtime data races, memory leak, and shutdown safety #171

Job	Run time
installed-package-macos	55s
linux (system, SHARED, ON, ON, OFF, OFF, OFF)	55s
macos (arm64;x86_64)	56s
installed-package-linux (fetched)	1m 9s
windows	2m 42s
linux (system, STATIC, OFF, OFF, ON, ON, OFF)	44s
installed-package-linux (system)	54s
android	1m 9s
linux (self-contained, STATIC, OFF, ON, OFF, OFF, ON)	1m 10s
ios (iphonesimulator, VENDORED, VENDORED)	1m 5s
ios (iphoneos, SYSTEM, SYSTEM)	1m 10s
macos (arm64)	37s
	13m 26s