Fetch value lazily #582

Job	Run time
rust_ci (ubuntu-latest, stable)	1m 6s
rust_ci (macos-latest, stable)	50s
rust_ci (macos-latest, beta)	1m 54s
rust_ci (windows-latest, beta)	3m 26s
rust_ci (windows-latest, stable)	2m 44s
rust_ci (ubuntu-latest, beta)	1m 43s
	11m 43s

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