R-CMD-check

use type checkers in `backend-*.R` files #1965

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Run time

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Job	Run time
macos-latest (release)	2m 50s
windows-latest (release)	5m 15s
windows-latest (4.1)	8m 15s
ubuntu-latest (devel)	3m 59s
ubuntu-latest (release)	3m 44s
ubuntu-latest (oldrel-1)	3m 39s
ubuntu-latest (oldrel-2)	3m 48s
ubuntu-latest (oldrel-3)	3m 53s
ubuntu-latest (oldrel-4)	3m 56s
	39m 19s