R-CMD-check

use `u()` in all examples #175

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Job	Run time
macos-latest (release)	2m 9s
windows-latest (release)	3m 30s
ubuntu-latest (devel)	2m 5s
ubuntu-latest (release)	2m 18s
ubuntu-latest (oldrel-1)	2m 5s
	12m 7s