Add comma escaping in values of comma-separated lists #2197

Job	Run time
rubocop	32s
tests (ubuntu-latest, truffleruby-head)	1m 33s
tests (macos-latest, 3.4)	28s
tests (macos-latest, 3.2)	24s
tests (macos-latest, head)	1m 14s
tests (macos-latest, 3.3)	29s
tests (ubuntu-latest, head)	1m 40s
tests (ubuntu-latest, 3.3)	32s
tests (ubuntu-latest, truffleruby)	2m 4s
tests (macos-latest, truffleruby-head)	1m 40s
tests (macos-latest, truffleruby)	1m 24s
tests (ubuntu-latest, 3.2)	29s
tests (ubuntu-latest, 3.4)	27s
	12m 56s

Provide feedback