Add test for #4243. Also fix warning from bootsnap: iseq.rb:18: warning: nested repeat operator '+' and '?' was replaced with '*' in regular expression: /(?<!\A)生誕祭(?:\d+)?\z/
Add test for #4243. Also fix warning from bootsnap: iseq.rb:18: warning: nested repeat operator '+' and '?' was replaced with '*' in regular expression: /(?<!\A)生誕祭(?:\d+)?\z/