Use `foo?` instead of `foo_opt` #1263

Job	Run time
steep-check (head)	17s
test-memory (head)	28s
test-ruby (head, master)	5m 43s
check-misc (head)	8s
test-ruby (3.0, master)	5m 41s
test-windows (head)	1m 48s
ruby-versions / Generate Ruby versions	4s
test (2.5)	26s
test (2.6)	35s
test (2.7)	24s
test (3.0)	16s
test (3.1)	11s
test (3.2)	12s
test (3.3)	10s
test (head)	14s
	16m 37s

Provide feedback