Prevent CSV injection attacks #1612

Job	Run time
rubocop	13s
tests (ubuntu-latest, 2.7)	23s
tests (ubuntu-latest, 3.0)	7s
tests (ubuntu-latest, 3.1)	9s
tests (ubuntu-latest, 3.2)	9s
tests (ubuntu-latest, head)	10s
tests (ubuntu-latest, truffleruby-22.2)	38s
tests (ubuntu-latest, truffleruby-22.3)	35s
tests (ubuntu-latest, truffleruby-head)	26s
tests (macos-latest, 2.7)	1m 3s
tests (macos-latest, 3.0)	17s
tests (macos-latest, 3.1)	34s
tests (macos-latest, 3.2)	30s
tests (macos-latest, head)	20s
tests (macos-latest, truffleruby-22.2)	1m 5s
tests (macos-latest, truffleruby-22.3)	1m 35s
tests (macos-latest, truffleruby-head)	1m 8s
	9m 22s

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