fixup! Add context string signature APIs #1031

Job	Run time
ci (macos-latest, stable, true)	6m 43s
ci (macos-latest, stable, false)	6m 32s
ci (macos-latest, beta, true)	6m 45s
ci (macos-latest, beta, false)	7m 14s
ci (macos-latest, nightly, true)	8m 8s
ci (macos-latest, nightly, false)	7m 22s
ci (ubuntu-latest, stable, true)	9m 50s
ci (ubuntu-latest, stable, false)	9m 28s
ci (ubuntu-latest, beta, true)	11m 24s
ci (ubuntu-latest, beta, false)	11m 35s
ci (ubuntu-latest, nightly, true)	11m 42s
ci (ubuntu-latest, nightly, false)	11m 44s
ci (windows-latest, stable, true)	12m 53s
ci (windows-latest, stable, false)	12m 20s
ci (windows-latest, beta, true)	13m 27s
ci (windows-latest, beta, false)	11m 47s
ci (windows-latest, nightly, true)	12m 25s
ci (windows-latest, nightly, false)	12m 46s
	3h 4m 5s

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