test

Use `string_as_id?` #507

Job	Run time
test-memory (head)	30s
steep-check (head)	13s
test-ruby (head, master)	6m 14s
test-ruby (3.0, master)	6m 13s
check-misc (head)	7s
test-windows (head)	1m 39s
ruby-versions / Generate Ruby versions	4s
test-cpp (head, g++)	12s
test (2.5)	28s
test-cpp (head, clang++)	16s
test (2.6)	26s
test (2.7)	26s
test (3.0)	17s
test (3.1)	17s
test (3.2)	13s
test (3.3)	12s
test (head)	12s
	17m 59s

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