Omit `#class` for simple values #1711

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.7)	1m 50s
test (3.0)	1m 56s
test (3.1)	1m 44s
test (3.2)	1m 44s
test (3.3)	1m 42s
test (debug)	2m 20s
test (head)	1m 25s
	12m 45s

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