Merge pull request #382 from seuros/master #194

Job	Run time
test-ubuntu-ruby (ruby-head, 11-3.0)	52s
test-ubuntu-ruby (ruby-head, 12-master)	53s
test-ubuntu-ruby (ruby-head, 13-master)	50s
test-ubuntu-ruby (ruby-head, 14-master)	50s
test-ubuntu-ruby (ruby-head, 15-master)	54s
test-ubuntu-ruby (3.2, 11-3.0)	1m 3s
test-ubuntu-ruby (3.2, 12-master)	1m 8s
test-ubuntu-ruby (3.2, 13-master)	1m 9s
test-ubuntu-ruby (3.2, 14-master)	1m 3s
test-ubuntu-ruby (3.2, 15-master)	1m 15s
test-ubuntu-ruby (3.1, 11-3.0)	1m 49s
test-ubuntu-ruby (3.1, 12-master)	2m 9s
test-ubuntu-ruby (3.1, 13-master)	1m 36s
test-ubuntu-ruby (3.1, 14-master)	2m 4s
test-ubuntu-ruby (3.1, 15-master)	1m 51s
test-ubuntu-ruby (3.0, 11-3.0)	1m 46s
test-ubuntu-ruby (3.0, 12-master)	1m 38s
test-ubuntu-ruby (3.0, 13-master)	1m 30s
test-ubuntu-ruby (3.0, 14-master)	1m 42s
test-ubuntu-ruby (3.0, 15-master)	2m 9s
	28m 11s

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