Do not use Object ref on vector/hashtable #475

Job	Run time
rust_ci (macos-latest, stable)	53s
rust_ci (macos-latest, beta)	57s
rust_ci (macos-latest, nightly)	1m 32s
rust_ci (ubuntu-latest, stable)	55s
rust_ci (ubuntu-latest, beta)	56s
rust_ci (ubuntu-latest, nightly)	1m 31s
rust_ci (windows-latest, stable)	3m 2s
rust_ci (windows-latest, beta)	1m 54s
rust_ci (windows-latest, nightly)	2m 43s
	14m 23s

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