R-CMD-check

use type checkers in `backend-*.R` files (#1556) #1966

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Run time

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Job	Run time
macos-latest (release)	4m 36s
windows-latest (release)	5m 15s
windows-latest (4.1)	7m 39s
ubuntu-latest (devel)	4m 42s
ubuntu-latest (release)	3m 59s
ubuntu-latest (oldrel-1)	4m 9s
ubuntu-latest (oldrel-2)	6m 48s
ubuntu-latest (oldrel-3)	4m 15s
ubuntu-latest (oldrel-4)	4m 31s
	45m 54s