Fix `difference()` giving extra NA values for short vectors #50

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Job	Run time
macOS-latest (release)	43s
windows-latest (release)	5m 24s
ubuntu-20.04 (devel)	15m 37s
ubuntu-20.04 (release)	3m 37s
ubuntu-20.04 (oldrel-1)	3m 2s
ubuntu-20.04 (oldrel-2)	5m 48s
ubuntu-20.04 (oldrel-3)	5m 24s
	39m 35s