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Fix runtime null handling and standard stream initialization #879

Job	Run time
rust_ci (ubuntu-latest, beta)	3m 10s
rust_ci (macos-latest, stable)	3m 8s
rust_ci (macos-latest, beta)	2m 57s
rust_ci (ubuntu-latest, stable)	3m 15s
rust_ci (windows-latest, stable)	3m 53s
rust_ci (windows-latest, beta)	5m 30s
	21m 53s