R-CMD-check

use type checkers in `backend-*.R` files #1964

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Run time

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Job	Run time
macos-latest (release)	2m 56s
windows-latest (release)	5m 8s
windows-latest (4.1)	6m 14s
ubuntu-latest (devel)	4m 26s
ubuntu-latest (release)	3m 33s
ubuntu-latest (oldrel-1)	3m 38s
ubuntu-latest (oldrel-2)	3m 48s
ubuntu-latest (oldrel-3)	3m 58s
ubuntu-latest (oldrel-4)	4m 18s
	37m 59s