Fix events map initialization to prevent race conditions #4251
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Initialization upon miss can lead to hard to debug scenarios where potentially a concurrent array will leak out but the value in the `@events` will be different. as described here: ruby-concurrency/concurrent-ruby#970
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Initialization upon miss can lead to hard to debug scenarios where potentially a concurrent array will leak out but the value in the
@eventswill be different.as described here: ruby-concurrency/concurrent-ruby#970