method type fix #608

Job	Run time
rust_ci (ubuntu-latest, stable)	1m 31s
rust_ci (macos-latest, beta)	1m 33s
rust_ci (ubuntu-latest, beta)	1m 28s
rust_ci (windows-latest, beta)	3m 2s
rust_ci (windows-latest, stable)	3m 23s
rust_ci (macos-latest, stable)	1m 47s
	12m 44s

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